docs: add clarification on non-editable metadata (#1939)

* docs: add clarification on non-editable metadata

* 🦉 Updates from OwlBot post-processor

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Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: JesseLovelace

google-cloud-storage/src/main/java/com/google/cloud/storage/Storage.java

@@ -2112,7 +2112,10 @@ public static Builder newBuilder() {
   Bucket create(BucketInfo bucketInfo, BucketTargetOption... options);
 
   /**
-   * Creates a new blob with no content.
+   * Creates a new blob with no content. Note that all <a
+   * href="https://cloud.google.com/storage/docs/metadata#fixed">non-editable metadata</a>, such as
+   * generation or metageneration, will be ignored even if it's present in the provided BlobInfo
+   * object.
    *
    * <p>Example of creating a blob with no content.
    *
@@ -2135,7 +2138,10 @@ public static Builder newBuilder() {
    * #writer} is recommended as it uses resumable upload. MD5 and CRC32C hashes of {@code content}
    * are computed and used for validating transferred data. Accepts an optional userProject {@link
    * BlobGetOption} option which defines the project id to assign operational costs. The content
-   * type is detected from the blob name if not explicitly set.
+   * type is detected from the blob name if not explicitly set. Note that all <a
+   * href="https://cloud.google.com/storage/docs/metadata#fixed">non-editable metadata</a>, such as
+   * generation or metageneration, will be ignored even if it's present in the provided BlobInfo
+   * object.
    *
    * <p>Example of creating a blob from a byte array:
    *
@@ -2159,7 +2165,10 @@ public static Builder newBuilder() {
    * {@code content}. For large content, {@link #writer} is recommended as it uses resumable upload.
    * MD5 and CRC32C hashes of {@code content} are computed and used for validating transferred data.
    * Accepts a userProject {@link BlobGetOption} option, which defines the project id to assign
-   * operational costs.
+   * operational costs. Note that all <a
+   * href="https://cloud.google.com/storage/docs/metadata#fixed">non-editable metadata</a>, such as
+   * generation or metageneration, will be ignored even if it's present in the provided BlobInfo
+   * object.
    *
    * <p>Example of creating a blob from a byte array:
    *
@@ -2184,7 +2193,10 @@ Blob create(
    * #writer} is recommended as it uses resumable upload. By default any MD5 and CRC32C values in
    * the given {@code blobInfo} are ignored unless requested via the {@code
    * BlobWriteOption.md5Match} and {@code BlobWriteOption.crc32cMatch} options. The given input
-   * stream is closed upon success.
+   * stream is closed upon success. Note that all <a
+   * href="https://cloud.google.com/storage/docs/metadata#fixed">non-editable metadata</a>, such as
+   * generation or metageneration, will be ignored even if it's present in the provided BlobInfo
+   * object.
    *
    * <p>This method is marked as {@link Deprecated} because it cannot safely retry, given that it
    * accepts an {@link InputStream} which can only be consumed once.
@@ -2226,7 +2238,9 @@ Blob create(
    * Uploads {@code path} to the blob using {@link #writer}. By default any MD5 and CRC32C values in
    * the given {@code blobInfo} are ignored unless requested via the {@link
    * BlobWriteOption#md5Match()} and {@link BlobWriteOption#crc32cMatch()} options. Folder upload is
-   * not supported.
+   * not supported. Note that all <a href="https://cloud.google.com/storage/docs/metadata#fixed">
+   * non-editable metadata</a>, such as generation or metageneration, will be ignored even if it's
+   * present in the provided BlobInfo object.
    *
    * <p>Example of uploading a file:
    *
@@ -2253,7 +2267,9 @@ Blob create(
    * Uploads {@code path} to the blob using {@link #writer} and {@code bufferSize}. By default any
    * MD5 and CRC32C values in the given {@code blobInfo} are ignored unless requested via the {@link
    * BlobWriteOption#md5Match()} and {@link BlobWriteOption#crc32cMatch()} options. Folder upload is
-   * not supported.
+   * not supported. Note that all <a href="https://cloud.google.com/storage/docs/metadata#fixed">
+   * non-editable metadata</a>, such as generation or metageneration, will be ignored even if it's
+   * present in the provided BlobInfo object.
    *
    * <p>{@link #createFrom(BlobInfo, Path, BlobWriteOption...)} invokes this method with a buffer
    * size of 15 MiB. Users can pass alternative values. Larger buffer sizes might improve the upload
@@ -2288,6 +2304,9 @@ Blob createFrom(BlobInfo blobInfo, Path path, int bufferSize, BlobWriteOption...
    * Reads bytes from an input stream and uploads those bytes to the blob using {@link #writer}. By
    * default any MD5 and CRC32C values in the given {@code blobInfo} are ignored unless requested
    * via the {@link BlobWriteOption#md5Match()} and {@link BlobWriteOption#crc32cMatch()} options.
+   * Note that all <a href="https://cloud.google.com/storage/docs/metadata#fixed">non-editable
+   * metadata</a>, such as generation or metageneration, will be ignored even if it's present in the
+   * provided BlobInfo object.
    *
    * <p>Example of uploading data with CRC32C checksum:
    *
@@ -2316,7 +2335,10 @@ Blob createFrom(BlobInfo blobInfo, InputStream content, BlobWriteOption... optio
    * Reads bytes from an input stream and uploads those bytes to the blob using {@link #writer} and
    * {@code bufferSize}. By default any MD5 and CRC32C values in the given {@code blobInfo} are
    * ignored unless requested via the {@link BlobWriteOption#md5Match()} and {@link
-   * BlobWriteOption#crc32cMatch()} options.
+   * BlobWriteOption#crc32cMatch()} options. Note that all <a
+   * href="https://cloud.google.com/storage/docs/metadata#fixed">non-editable metadata</a>, such as
+   * generation or metageneration, will be ignored even if it's present in the provided BlobInfo
+   * object.
    *
    * <p>{@link #createFrom(BlobInfo, InputStream, BlobWriteOption...)} )} invokes this method with a
    * buffer size of 15 MiB. Users can pass alternative values. Larger buffer sizes might improve the