fix(git): resolve typos within the pull request documentation page

'Title' was displayed correctly in subheader, but as 'Subject' in page content (as per GitHub documentation, this should indeed be 'Title'; ref: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/creating-a-pull-request#:~:text=Type%20a-,title,-and%20description%20for)

git/pull-request-naming.md

@@ -4,7 +4,7 @@ Consists of two parts:
 - Title: Short informative summary of the pull request
 - Description: More detailed explanatory text describing the PR for the reviewer
 
-## Subject:
+## Title:
 - Short and descriptive summary
 - Start with corresponding ticket/story id (e.g. from Jira, GitHub issue, etc.)
 - Should be capitalized and written in imperative present tense
@@ -32,4 +32,4 @@ To achieve this, we needed to:
 - Find the best Gitbook plugin which can do the work
 - Integrate it in all the pages to redirect the user to the right page on GitHub for editing
 - Make it visible on the page so users can notice it easily
-```
+```