Convert inline `{@see}` links for hooks

[DrewAPicture]

As discussed with @blobaugh and @coffee2code at the WCSF team work days, we've opted to use the inline {@see} type syntax for linking to reference articles from reference fields and in the handbooks.

The existing make_doclink_clickable() function already makes auto-linking possible for class methods, classes, and functions. The attached patch adds support for hooks when wrapped in single quotes, e.g. `{@see 'pre_get_search_form'}.

I've described the syntax for the above four link types in comment:5:ticket:181.

[coffee2code]

In 974:

developer.wordpress.org: convert inline {@see} links for hooks

fixes #706.
props DrewAPicture.