docs: use a single space instead of an unbreakable space

Documentation/GIT_CONVENTION.md

@@ -49,7 +49,7 @@ The commit message should follow this regex:
 /^(revert: )?(build|ci|chore|docs|feat|fix|perf|refactor|style|refactor|revert|style|test|)(\(.+\))?: .{1,50}/
 ```
 
-### See also
+### See also
 - [Git Commit Msg](http://karma-runner.github.io/1.0/dev/git-commit-msg.html)
 - [Semantic Commit Messages](https://seesparkbox.com/foundry/semantic_commit_messages)
 - [Enhance your git log with conventional commits](https://dev.to/maxpou/enhance-your-git-log-with-conventional-commits-3ea4)