docs: Update @return description for font URL functions across multiple themes.

Author: huzaifaalmesbah

src/wp-content/themes/twentyfifteen/functions.php

@@ -366,7 +366,7 @@ function twentyfifteen_widgets_init() {
 	 * @since Twenty Fifteen 1.0
 	 * @since Twenty Fifteen 3.4 Replaced Google URL with self-hosted fonts.
 	 *
-	 * @return string Fonts URL for the theme.
+	 * @return string Font stylesheet or empty string if disabled.
 	 */
 	function twentyfifteen_fonts_url() {
 		$fonts_url = '';

src/wp-content/themes/twentyfourteen/functions.php

@@ -315,7 +315,7 @@ function twentyfourteen_widgets_init() {
 	 * @since Twenty Fourteen 1.0
 	 * @since Twenty Fourteen 3.6 Replaced Google URL with self-hosted fonts.
 	 *
-	 * @return string Fonts URL for the theme.
+	 * @return string Font stylesheet or empty string if disabled.
 	 */
 	function twentyfourteen_font_url() {
 		$font_url = '';

src/wp-content/themes/twentyseventeen/functions.php

@@ -289,7 +289,7 @@ function twentyseventeen_content_width() {
 	 * @since Twenty Seventeen 1.0
 	 * @since Twenty Seventeen 3.2 Replaced Google URL with self-hosted fonts.
 	 *
-	 * @return string Fonts URL for the theme.
+	 * @return string Font stylesheet or empty string if disabled.
 	 */
 	function twentyseventeen_fonts_url() {
 		$fonts_url = '';

src/wp-content/themes/twentysixteen/functions.php

@@ -334,7 +334,7 @@ function twentysixteen_widgets_init() {
 	 * @since Twenty Sixteen 1.0
 	 * @since Twenty Sixteen 2.9 Replaced Google URL with self-hosted fonts.
 	 *
-	 * @return string Fonts URL for the theme.
+	 * @return string Font stylesheet or empty string if disabled.
 	 */
 	function twentysixteen_fonts_url() {
 		$fonts_url = '';