docs: update github syntax of warning

[ersachin3112]

This PR contains a:

• [ ] bugfix
• [ ] new feature
• [ ] code refactor
• [ ] test update
• [x] typo fix
• [x] metadata update

Motivation / Use-Case

update github syntax of warning

Breaking Changes

No

Additional Info

No

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 88.02%. Comparing base (d2651fc) to head (d519b1c). Report is 6 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #691 +/- ## ========================================== - Coverage 88.30% 88.02% -0.28% ========================================== Files 3 3 Lines 359 359 Branches 118 118 ========================================== - Hits 317 316 -1 - Misses 38 39 +1 Partials 4 4 ```

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