Update invalid syntax / wording

[kyan0045]

Implementation of proposed changes in #35396

Why:

Closes: #35396

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

Corrects statement about MediaWiki statement, improves wording and removes bullet point that was identified as no longer needed.

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require a SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing.

[github-actions]

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Content directory changes

You may find it useful to copy this table into the pull request summary. There you can edit it to share links to important articles or changes and to give a high-level overview of how the changes in your pull request support the overall goals of the pull request.

Source	Preview	Production	What Changed
communities/documenting-your-project-with-wikis/editing-wiki-content.md	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10

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fpt: Free, Pro, Team
ghec: GitHub Enterprise Cloud
ghes: GitHub Enterprise Server

[lalithaar]

I was thinking to fix it, saw your PR - great job

[nguyenalex836]

@kyan0045 Thanks so much for opening a PR with this fix! I'll get this merged 🍏

[github-actions]

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