Update release_build_files/readme.md

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: AustinBenoit

release_build_files/readme.md

@@ -616,8 +616,8 @@ code.
 ### 13.3.0
 -   Changes
     - Storage: Add support for Firebase Storage emulator via `UseEmulator`.
-	  The `UseEmulator` method should be called before invoking any other
-	  methods on a new instance of Storage. Default port is 9199.
+        The `UseEmulator` method should be called before invoking any other
+        methods on a new instance of Storage. Default port is 9199.
 
 ### 13.2.0
 -   Changes