Merge pull request #10638: [website][BEAM-9153] Fix release guide heading level

diff --git a/website/src/contribute/release-guide.md b/website/src/contribute/release-guide.md
index 0b5117a..d7c3a7c 100644
--- a/website/src/contribute/release-guide.md
+++ b/website/src/contribute/release-guide.md
@@ -1248,7 +1248,7 @@
    delete the `.asc`, `.sha512`;
 3. Upload the new release `twine upload *` from the directory with the `.zip` and `.whl` files;
 
-#### Deploy source release to dist.apache.org
+### Deploy source release to dist.apache.org
 
 Copy the source release from the `dev` repository to the `release` repository at `dist.apache.org` using Subversion.