Update why-are-my-contributions-not-showing-up-on-my-profile.md

[aditi5926]

Added an extra point which might clear doubts of many people.

Why:

Actually, One day when I contributed to a repository and for some reason, I deleted that this removed all my contribution counts. I kept on thinking about how this happened, then I came to know these deleted contributions are not counted hence, I thought of opening the issue and clearing the doubts of many others by adding this point in GitHub Docs.

Closes: Solution for this issue #33525

What's being changed (if available, include any code snippets, screenshots, or gifs):

Check off the following:

• I have reviewed my changes in staging, available via the View deployment link in this PR's timeline (this link will be available after opening the PR).

  • For content changes, you will also see an automatically generated comment with links directly to pages you've modified. The comment won't appear if your PR only edits files in the data directory.

• For content changes, I have completed the self-review checklist.