Fix #525 Minor syntax issues in contribution guidelines

[jawadhussein462]

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes #525

Type of change

• Documentation update (non-breaking change that improves or corrects documentation)

Checklist

• [x] I have read the contributing guidelines
• [x] I have updated the HISTORY.rst and AUTHORS.rst files
• [x] Linting passes successfully : make lint
• [x] Typing passes successfully : make type-check
• [x] Unit tests pass successfully : make tests
• [x] Coverage is 100% : make coverage
• [x] Documentation builds successfully : make doc

[codecov-commenter]

Codecov Report

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

Project coverage is 100.00%. Comparing base (614293e) to head (739af29). Report is 785 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #530 +/- ## =========================================== Coverage 100.00% 100.00% =========================================== Files 39 62 +23 Lines 4616 5994 +1378 Branches 487 603 +116 =========================================== + Hits 4616 5994 +1378 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.