IllealRefCountException should be IllegalReferenceCountException, fix typos

Motivation:

Typos in javadoc, in "combine" and "recommendations", IllegalReferenceCountException

Modification:

Rename incorrect reference, typos are modified

Result:

Reference is correct, typos are fixed

Author: ifesdjeen

codec-http/src/main/java/io/netty/handler/codec/http/DefaultFullHttpRequest.java

@@ -28,7 +28,7 @@ public class DefaultFullHttpRequest extends DefaultHttpRequest implements FullHt
     private final HttpHeaders trailingHeader;
 
     /**
-     * Used to cache the value of the hash code and avoid {@link IllegalRefCountException}.
+     * Used to cache the value of the hash code and avoid {@link IllegalReferenceCountException}.
      */
     private int hash;
 

codec-http/src/main/java/io/netty/handler/codec/http/DefaultFullHttpResponse.java

@@ -30,7 +30,7 @@ public class DefaultFullHttpResponse extends DefaultHttpResponse implements Full
     private final HttpHeaders trailingHeaders;
 
     /**
-     * Used to cache the value of the hash code and avoid {@link IllegalRefCountException}.
+     * Used to cache the value of the hash code and avoid {@link IllegalReferenceCountException}.
      */
     private int hash;
 

codec-http/src/main/java/io/netty/handler/codec/http/FullHttpRequest.java

@@ -18,7 +18,7 @@
 import io.netty.buffer.ByteBuf;
 
 /**
- * Combinate the {@link HttpRequest} and {@link FullHttpMessage}, so the request is a <i>complete</i> HTTP
+ * Combine the {@link HttpRequest} and {@link FullHttpMessage}, so the request is a <i>complete</i> HTTP
  * request.
  */
 public interface FullHttpRequest extends HttpRequest, FullHttpMessage {

codec-http/src/main/java/io/netty/handler/codec/http/multipart/HttpPostRequestEncoder.java

@@ -61,7 +61,7 @@ public class HttpPostRequestEncoder implements ChunkedInput<HttpContent> {
     public enum EncoderMode {
         /**
          * Legacy mode which should work for most. It is known to not work with OAUTH. For OAUTH use
-         * {@link EncoderMode#RFC3986}. The W3C form recommentations this for submitting post form data.
+         * {@link EncoderMode#RFC3986}. The W3C form recommendations this for submitting post form data.
          */
         RFC1738,