Fix blob documentation link

Change-Id: I71684e81c6cca77bcf7a84fbb5a65db33497cbe6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1822417
Commit-Queue: enne <enne@chromium.org>
Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
Auto-Submit: enne <enne@chromium.org>
Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699438}

storage/browser/blob/blob_reader.h

@@ -48,7 +48,7 @@ class FileStreamReader;
 // Use a BlobDataHandle to create an instance.
 //
 // For more information on how to read Blobs in your specific situation, see:
-// https://chromium.googlesource.com/chromium/src/+/HEAD/storage/browser/blob/README.md#accessing-reading
+// https://chromium.googlesource.com/chromium/src/+/HEAD/storage/browser/blob/README.md#how-to-use-blobs-browser_side-accessing-reading
 class COMPONENT_EXPORT(STORAGE_BROWSER) BlobReader {
  public:
   class COMPONENT_EXPORT(STORAGE_BROWSER) FileStreamReaderProvider {