Clarify documentation for `versioning-strategy` option

[jeffwidman]

We receive the occasional support request and there are also multiple issues filed against https://github.com/dependabot/dependabot-core/ asking about "I tried X strategy for Y ecosystem but it's not working".

So rewrite this sections of the docs to add some clarity:

1. Add table illustrating how the different strategies work for a given scenario (🎩 💁‍♂️ to @jonasfj from https://github.com/dependabot/dependabot-core/issues/4979#issue-1196967453)
2. Invert the table from "strategy -> supported ecosystems" to "ecosystem -> supported strategies" because our users arrive with questions about a given ecosystem, not a given strategy
3. Add additional ecosystems to the list
4. Shorten the example because we only need one, additional ones just contribute to the #walloftext feeling
5. Re-order everything lexicographically

Hopefully this will provide better documentation that we can point users to in response to questions.

Co-authored-by: Jonas Finnemann Jensen [email protected]

Why:

Closes [issue link]

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Source	Preview	Production	What Changed
code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file.md	fpt ghec ghes@ 3.9 3.8 3.7 3.6	fpt ghec ghes@ 3.9 3.8 3.7 3.6

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

[cmwilson21]

👋 @jeffwidman - I noticed this PR is a draft. Let me know when it is ready for review and I'll get it triaged ⚡

[github-actions[bot]]

A stale label has been added to this pull request because it has been open 7 days with no activity. To keep this PR open, add a comment or push a commit within 3 days.

[jeffwidman]

Not stale, just haven't gotten time to finish it out yet

[github-actions[bot]]

A stale label has been added to this pull request because it has been open 7 days with no activity. To keep this PR open, add a comment or push a commit within 3 days.

[abdulapopoola]

@jeffwidman is this part of the doc drive for this quarter?

[steveoh]

These docs would be a huge improvement. Where's the finish line?

[jeffwidman]

@cmwilson21 this is ready for review.

Reviewers--if you have questions, feel free to also ping me on the internal company slack.

[cmwilson21]

@jeffwidman Thanks for letting me know! I'll get it on the board ⚡

[zvailanu98]

jeffwidman:patch-4

[jeffwidman]

Thanks! Let me incorporate these changes and then squash down to keep commit history clean.

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