Docs: Document the show_split_view argument for wp_text_diff().

Convert `$args` array documentation to hash notation.

Props riddhiehta02, jeremyfelt, SergeyBiryukov.
Fixes #47224.

git-svn-id: https://develop.svn.wordpress.org/trunk@45778 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/pluggable.php

@@ -2669,15 +2669,6 @@ function get_avatar( $id_or_email, $size = 96, $default = '', $alt = '', $args =
 	 * HTML, so the primary use is for displaying the changes. If the two strings
 	 * are equivalent, then an empty string will be returned.
 	 *
-	 * The arguments supported and can be changed are listed below.
-	 *
-	 * 'title' : Default is an empty string. Titles the diff in a manner compatible
-	 *      with the output.
-	 * 'title_left' : Default is an empty string. Change the HTML to the left of the
-	 *      title.
-	 * 'title_right' : Default is an empty string. Change the HTML to the right of
-	 *      the title.
-	 *
 	 * @since 2.6.0
 	 *
 	 * @see wp_parse_args() Used to change defaults to user defined settings.
@@ -2686,14 +2677,26 @@ function get_avatar( $id_or_email, $size = 96, $default = '', $alt = '', $args =
 	 *
 	 * @param string       $left_string  "old" (left) version of string
 	 * @param string       $right_string "new" (right) version of string
-	 * @param string|array $args         Optional. Change 'title', 'title_left', and 'title_right' defaults.
+	 * @param string|array $args {
+	 *     Associative array of options to pass to WP_Text_Diff_Renderer_Table().
+	 *
+	 *     @type string $title           Titles the diff in a manner compatible
+	 *                                   with the output. Default empty.
+	 *     @type string $title_left      Change the HTML to the left of the title.
+	 *                                   Default empty.
+	 *     @type string $title_right     Change the HTML to the right of the title.
+	 *                                   Default empty.
+	 *     @type bool   $show_split_view True for split view (two columns), false for
+	 *                                   un-split view (single column). Default true.
+	 * }
 	 * @return string Empty string if strings are equivalent or HTML with differences.
 	 */
 	function wp_text_diff( $left_string, $right_string, $args = null ) {
 		$defaults = array(
-			'title'       => '',
-			'title_left'  => '',
-			'title_right' => '',
+			'title'           => '',
+			'title_left'      => '',
+			'title_right'     => '',
+			'show_split_view' => true,
 		);
 		$args     = wp_parse_args( $args, $defaults );