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.


git-svn-id: https://develop.svn.wordpress.org/trunk@29163 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/theme.php

@@ -1947,6 +1947,8 @@ function wp_customize_support_script() {
  *
  * @since 4.0.0
  *
+ * @global WP_Customize_Manager $wp_customize Customizer instance.
+ *
  * @return bool True if the site is being previewed in the Customizer, false otherwise.
  */
 function is_customize_preview() {