Docs: Add a summary, version, and parameter and return descriptions to the DocBlock for WP_Filesystem_FTPext::get_contents().

Also reverses the return types as `string` is expected, `false` is the outlier.

See [30978].

See #30989. See #32246.


git-svn-id: https://develop.svn.wordpress.org/trunk@34493 602fd350-edb4-49c9-b593-d223f7449a82

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

@@ -93,10 +93,14 @@ class WP_Filesystem_FTPext extends WP_Filesystem_Base {
 	}
 
 	/**
+	 * Retrieves the file contents.
+	 *
+	 * @since 2.5.0
 	 * @access public
 	 *
-	 * @param string $file
-	 * @return false|string
+	 * @param string $file Filename.
+	 * @return string|false File contents on success, false if no temp file could be opened,
+	 *                      or if the file couldn't be retrieved.
 	 */
 	public function get_contents( $file ) {
 		$tempfile = wp_tempnam($file);