Update to include MariaDB and remove SQL Server in README (.txt and .md)

[robertsilen]

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Considering the technical requirements (https://manual.joomla.org/docs/next/get-started/technical-requirements/) include MariaDB, I humbly suggest the README.txt should include MariaDB too. I removed "SQL Server" from list of databases, as mentioned in another discussion (https://github.com/joomla/joomla-cms/pull/43343). There is a separate PR for the .md version of the README.

Pull Request for Issue # .

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[Quy]

Please combine your PRs into one under the v4.4 branch as it will be upmerged to v5.1. Thanks.

[robertsilen]

Please combine your PRs into one under the v4.4 branch as it will be upmerged to v5.1. Thanks.

I was told in PR for 4.4 to make a PR for 5.1 as this content is relevant for 5.1 and not 4.4. So I presume I should not go back on this?

Do you want me to merge this with the PR for README.md? Not sure how to do that.

[Quy]

I was told in PR for 4.4 to make a PR for 5.1 as this content is relevant for 5.1 and not 4.4. So I presume I should not go back on this?

Commented in the other PR.

Do you want me to merge this with the PR for README.md? Not sure how to do that.

Switch to patch-4 branch. Apply the change from the other branch.

[robertsilen]

I was told in PR for 4.4 to make a PR for 5.1 as this content is relevant for 5.1 and not 4.4. So I presume I should not go back on this?

Commented in the other PR.

Do you want me to merge this with the PR for README.md? Not sure how to do that.

Switch to patch-4 branch. Apply the change from the other branch.

This PR for 5.5 includes MariaDB and SQL Server modifications to README.txt and README.md now. For 4.4 version there is this PR.

[Quy]

I have tested this item :white_check_mark: successfully on 1205699293a2407b7cccbada7864a684f6ea2f5a

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[viocassel]

I have tested this item :white_check_mark: successfully on 1205699293a2407b7cccbada7864a684f6ea2f5a

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[Quy]

RTC

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[LadySolveig]

Thank you @robertsilen and for review @Quy @viocassel