docs: update javadoc for createFrom (#2522)

* docs: update javadoc for createFrom * 🦉 Updates from OwlBot post-processor See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md --------- 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

@@ -2906,33 +2906,30 @@ Blob create(
  Blob createFrom(BlobInfo blobInfo, Path path, BlobWriteOption... options) throws IOException;
 
  /**
- * 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
+ * Uploads {@code path} to the blob using {@code ResumableSession}. 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. 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
- * performance but require more memory. This can cause an OutOfMemoryError or add significant
- * garbage collection overhead. Smaller buffer sizes reduce memory consumption, that is noticeable
- * when uploading many objects in parallel. Buffer sizes less than 256 KiB are treated as 256 KiB.
+ * <p>This method used to preallocate a buffer, but since v2.25.0, it uses a ResumableSession and
+ * no longer needs it. The bufferSize parameter is still present for binary compatibility, but is
+ * now ignored.
  *
  * <p>Example of uploading a humongous file:
  *
  * <pre>{@code
  * BlobId blobId = BlobId.of(bucketName, blobName);
  * BlobInfo blobInfo = BlobInfo.newBuilder(blobId).setContentType("video/webm").build();
  *
- * int largeBufferSize = 150 * 1024 * 1024;
  * Path file = Paths.get("humongous.file");
- * storage.createFrom(blobInfo, file, largeBufferSize);
+ * storage.createFrom(blobInfo, file, 0);
  * }</pre>
  *
  * @param blobInfo blob to create
  * @param path file to upload
- * @param bufferSize size of the buffer I/O operations
+ * @param bufferSize ignored field, still present for compatibility purposes
  * @param options blob write options
  * @return a {@code Blob} with complete information
  * @throws IOException on I/O error