Site Health: Correct the check for a static robots.txt file.

This ensures that the file existence is properly detected when WordPress is located in a subdirectory while the home URL points to the website root.

Follow-up to [59890].

Props timse201, mukesh27.
Fixes #64580.

git-svn-id: https://develop.svn.wordpress.org/trunk@61577 602fd350-edb4-49c9-b593-d223f7449a82

Author: SergeyBiryukov

src/wp-admin/includes/class-wp-debug-data.php

@@ -505,12 +505,12 @@ private static function get_wp_server(): array {
 		}
 
 		// Check if a robots.txt file exists.
-		if ( is_file( ABSPATH . 'robots.txt' ) ) {
+		if ( is_file( get_home_path() . 'robots.txt' ) ) {
 			// If the file exists, turn debug info to true.
 			$robotstxt_debug = true;
 
 			/* translators: %s: robots.txt */
-			$robotstxt_string = sprintf( __( 'There is a static %s file in your installation folder. WordPress cannot dynamically serve one.' ), 'robots.txt' );
+			$robotstxt_string = sprintf( __( 'Your site is using a static %s file. WordPress cannot dynamically serve one.' ), 'robots.txt' );
 		} elseif ( got_url_rewrite() ) {
 			// No robots.txt file available and rewrite rules in place, turn debug info to false.
 			$robotstxt_debug = false;
@@ -522,7 +522,7 @@ private static function get_wp_server(): array {
 			$robotstxt_debug = true;
 
 			/* translators: %s: robots.txt */
-			$robotstxt_string = sprintf( __( 'WordPress cannot dynamically serve a %s file due to a lack of rewrite rule support' ), 'robots.txt' );
+			$robotstxt_string = sprintf( __( 'WordPress cannot dynamically serve a %s file due to a lack of rewrite rule support.' ), 'robots.txt' );
 
 		}