DOCS: Replace HTTP links with HTTPS.

Replaces unsecure links in documentation and translator comments with their secure versions.

Props johnpgreen, netweb

Fixes #36993

Built from https://develop.svn.wordpress.org/trunk@37674


git-svn-id: http://core.svn.wordpress.org/trunk@37640 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/plugin.php

@@ -8,7 +8,7 @@
  * To hook methods, you'll need to pass an array one of two ways.
  *
  * Any of the syntaxes explained in the PHP documentation for the
- * {@link http://us2.php.net/manual/en/language.pseudo-types.php#language.types.callback 'callback'}
+ * {@link https://secure.php.net/manual/en/language.pseudo-types.php#language.types.callback 'callback'}
  * type are valid.
  *
  * Also see the {@link https://codex.wordpress.org/Plugin_API Plugin API} for