Fix some hardcoded image references

Author: hardys

asciidoc/components/longhorn.adoc

@@ -260,7 +260,7 @@ cat << EOF > $CONFIG_DIR/iso-definition.yaml
 apiVersion: {version-eib-api-latest}
 image:
   imageType: iso
-  baseImage: SL-Micro.x86_64-6.0-Base-SelfInstall-GM2.install.iso
+  baseImage: {micro-base-image-iso}
   arch: x86_64
   outputImageName: eib-image.iso
 kubernetes:

asciidoc/quickstart/elemental.adoc

@@ -231,7 +231,7 @@ From a Linux system with Podman installed, create the directories and place the
 [,bash]
 ----
 mkdir -p $ELEM/eib_quickstart/base-images
-cp /path/to/downloads/SL-Micro.x86_64-6.0-Base-SelfInstall-GM2.install.iso $ELEM/eib_quickstart/base-images/
+cp /path/to/downloads/{micro-base-image-iso} $ELEM/eib_quickstart/base-images/
 mkdir -p $ELEM/eib_quickstart/elemental
 ----