WP Filesystem: Correctly set the @since for WP_Filesystem_Base::getchmod() added in r32923.

This is 2.5.0 as that's when the function become available in all subclasses.
See #29548


git-svn-id: https://develop.svn.wordpress.org/trunk@32924 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/class-wp-filesystem-base.php

@@ -354,7 +354,7 @@ class WP_Filesystem_Base {
 	/**
 	 * Gets the permissions of the specified file or filepath in their octal format
 	 *
-	 * @since 4.0
+	 * @since 2.5.0
 	 * @param string $file
 	 * @return string the last 3 characters of the octal number
 	 */