Convert default arguments documentation for `get_terms()` into a hash notation.

See #28841.

Built from https://develop.svn.wordpress.org/trunk@29128


git-svn-id: http://core.svn.wordpress.org/trunk@28913 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add indentation for the hash notation missed in [29128].

See #28841.

Built from https://develop.svn.wordpress.org/trunk@29129


git-svn-id: http://core.svn.wordpress.org/trunk@28914 1a063a9b-81f0-0310-95a4-ce76da25c4cd