Docs: Correct grammar when referring to "a URL" vs "an URL" in several places.

Fixes #36218.

git-svn-id: https://develop.svn.wordpress.org/trunk@36970 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/class-wp-press-this.php

@@ -379,7 +379,7 @@ class WP_Press_This {
 			return ''; // Return empty rather than a truncated/invalid URL
 		}
 
-		// Does not look like an URL.
+		// Does not look like a URL.
 		if ( ! preg_match( '/^([!#$&-;=?-\[\]_a-z~]|%[0-9a-fA-F]{2})+$/', $url ) ) {
 			return '';
 		}

src/wp-admin/includes/file.php

@@ -469,7 +469,7 @@ function wp_handle_sideload( &$file, $overrides = false, $time = null ) {
 
 
 /**
- * Downloads a url to a local temporary file using the WordPress HTTP Class.
+ * Downloads a URL to a local temporary file using the WordPress HTTP Class.
  * Please note, That the calling function must unlink() the file.
  *
  * @since 2.5.0

src/wp-admin/includes/image.php

@@ -28,7 +28,7 @@ function wp_crop_image( $src, $src_x, $src_y, $src_w, $src_h, $dst_w, $dst_h, $s
 		$src_file = get_attached_file( $src );
 
 		if ( ! file_exists( $src_file ) ) {
-			// If the file doesn't exist, attempt a url fopen on the src link.
+			// If the file doesn't exist, attempt a URL fopen on the src link.
 			// This can occur with certain file replication plugins.
 			$src = _load_image_to_edit_path( $src, 'full' );
 		} else {

src/wp-admin/menu-header.php

@@ -109,7 +109,7 @@ function _wp_menu_output( $menu, $submenu, $submenu_as_parent = true ) {
 		}
 
 		/*
-		 * If the string 'none' (previously 'div') is passed instead of an URL, don't output
+		 * If the string 'none' (previously 'div') is passed instead of a URL, don't output
 		 * the default menu image so an icon can be added to div.wp-menu-image as background
 		 * with CSS. Dashicons and base64-encoded data:image/svg_xml URIs are also handled
 		 * as special cases.