Inline documentation cleanup for 4.0 audit.

Various improvements:
* Adds `@see` reference for `wp_list_comments()` in 'wp_list_comments_args' filter docs, added in [28285]
* Various phpDoc tweaks for the 'run_wptexturize' filter docs, added in [28715]
* Sentence and wrapping changes for `is_https_url()`, added in [28894]
* Documents the `$args` parameter for `wp_dropdown_languages()`, added in [29007]
* Adds a period to the parameter description for `_update_posts_count_on_delete()`, added in [28835]
* Documents a global in `is_customize_preview()`, added in [28999]
* phpDoc tweaks, adds an access modifier for `wpdb::esc_like()`, added in [28711]

See #28885.

Built from https://develop.svn.wordpress.org/trunk@29163


git-svn-id: http://core.svn.wordpress.org/trunk@28947 1a063a9b-81f0-0310-95a4-ce76da25c4cd