4.1 Docs Audit: Ensure optional arguments in `wp_json_encode()` are properly documented as such.

See #30469.

Built from https://develop.svn.wordpress.org/trunk@30613


git-svn-id: http://core.svn.wordpress.org/trunk@30603 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Improve line-wrapping and formatting in the DocBlock for `wp_send_json_error()`.

See #30469.

Built from https://develop.svn.wordpress.org/trunk@30614


git-svn-id: http://core.svn.wordpress.org/trunk@30604 1a063a9b-81f0-0310-95a4-ce76da25c4cd