Javadoc update

Author: tqranjan

server/src/main/java/org/opensearch/common/blobstore/BlobContainer.java

@@ -199,8 +199,6 @@ default void writeBlobConditionally(
      *          this value is used in writing the blob to the repository.
      * @param   failIfAlreadyExists
      *          whether to throw a FileAlreadyExistsException if the given blob already exists
-     * @param   metadata
-     *          The metadata to be associate with the blob upload.
      * @param   options
      *          The {@link ConditionalWriteOptions} specifying the preconditions that must be met for the upload to proceed.
      * @param   listener

server/src/main/java/org/opensearch/common/blobstore/ConditionalWrite.java

@@ -85,6 +85,10 @@ public Instant getUnmodifiedSince() {
             return unmodifiedSince;
         }
 
+        /**
+         * Builder for {@link ConditionalWriteOptions}.
+         * Allows fine-grained construction of conditional write criteria.
+         */
         public static final class Builder {
             private boolean ifNotExists = false;
             private boolean ifMatch = false;