Docs: Various docblock corrections.

See #54729


git-svn-id: https://develop.svn.wordpress.org/trunk@53300 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/general-template.php

@@ -1315,7 +1315,7 @@ function _wp_render_title_tag() {
  *                            Default '»'.
  * @param bool   $display     Optional. Whether to display or retrieve title. Default true.
  * @param string $seplocation Optional. Location of the separator ('left' or 'right').
- * @return string|void String when `$display` is true, nothing otherwise.
+ * @return string|void String when `$display` is false, nothing otherwise.
  */
 function wp_title( $sep = '»', $display = true, $seplocation = '' ) {
 	global $wp_locale;
@@ -1636,7 +1636,7 @@ function single_term_title( $prefix = '', $display = true ) {
  *
  * @param string $prefix  Optional. What to display before the title.
  * @param bool   $display Optional. Whether to display or retrieve title. Default true.
- * @return string|void Title when retrieving.
+ * @return string|false|void False if there's no valid title for the month. Title when retrieving.
  */
 function single_month_title( $prefix = '', $display = true ) {
 	global $wp_locale;