[openstreetmap/openstreetmap-website] Fix grammar and punctuation in CONTRIBUTING md (PR #5637)

[Serge Croisé]

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### Description
- a change that involv**es** ...
- e.**g.,** using ...

### How has this been tested?
<!--Explain the steps you took to test your code.-->

You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/5637

-- Commit Summary --

  * Fix grammar and punctuation in CONTRIBUTING md

-- File Changes --

    M CONTRIBUTING.md (4)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/5637.patch
https://github.com/openstreetmap/openstreetmap-website/pull/5637.diff

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