[JsonPath] Add test documentation for the component

[vinceAmstoutz]

Updates the documentation to document JsonPathAssertionsTrait and related constraints (closes #20977).

Complete the previous work done in #21078.

[javiereguiluz]

Nice work Vincent! Thanks.

[vinceAmstoutz]

@alamirault a composer require phpunit/phpunit --dev is it necessary to correct this CI work? I can make a PR if necessary.

[OskarStark]

@alamirault a composer require phpunit/phpunit --dev is it necessary to correct this CI work? I can make a PR if necessary.

Might be a good idea, @symfony/docs WDYT?

[vinceAmstoutz]

Rebased from 7.3 ✅

[alexandre-daubois]

Try to wrap your lines at 80 chars overall 🙂

[OskarStark]

~80 chars 😄 not a hard limit, but an orientation

[vinceAmstoutz]

@alexandre-daubois Done for 80 👍

[vinceAmstoutz]

But for lisst when I rendenring them it's look like :/ @alexandre-daubois @OskarStark

[alexandre-daubois]

Try indenting with the rest, i.e. two spaces for each line under the list item

[vinceAmstoutz]

Try indenting with the rest, i.e. two spaces for each line under the list item

Done everywhere, its works as expected! 👍

[javiereguiluz]

Merged! Thanks a lot Vincent for your recent contributions to Symfony Docs!