docs: update PHPUnit testing README.md with corrections #62065

[q0rban]

Correct the in-repo PHPUnit testing instructions, and switch to Markdown.

Trac ticket: https://core.trac.wordpress.org/ticket/62065

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[github-actions]

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[github-actions]

Hi @q0rban! 👋

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[github-actions]

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[ironprogrammer]

Thanks for running through and testing the PHPUnit setup, and helping improve the docs, @q0rban! I've left a few suggestions below.

Also, don't forget to link your GH and WPORG accounts so you can get your props!

[ironprogrammer]

Suggested change

	1. Check out the wordpress-develop repository
	git clone git://develop.git.wordpress.org/ wordpress-develop
	1. Check out the [`wordpress-develop` repository](https://github.com/WordPress/wordpress-develop):
	git clone git@github.com:WordPress/wordpress-develop.git

I wonder if this should instead refer to the Github repo, as PRs there are the typical way to contribute patches and tests.

[ironprogrammer]

Suggested change

	2. Run `composer update --with-all-dependencies`
	2. Run `composer update --with-all-dependencies`.

Nit.

[ironprogrammer]

Suggested change

	- To execute a particular test:
	$ vendor/bin/phpunit tests/phpunit/tests/test_case.php
	- To execute all tests:
	$ vendor/bin/phpunit
	- To execute a particular test:
	vendor/bin/phpunit tests/phpunit/tests/test_case.php
	- To execute all tests:
	vendor/bin/phpunit

Suggest dropping the terminal prompt character. For these commands, please substitute the block formatting spaces by wrapping with three backticks for consistency with other docs (I'm unsure how to add these within a backticked suggestion block 😅).

[ironprogrammer]

Suggested change

	cd wordpress-develop
	cd wordpress-develop

For this and the git clone line above it, please wrap with three backticks instead of spaces (for example).