tools: fix lint-pr-url message

PR-URL: #37304
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

tools/lint-pr-url.mjs

@@ -28,7 +28,7 @@ for await (const line of diff) {
   } else if (!validatePrUrl(line.match(prUrlDefinition)?.[1])) {
     console.warn(
       `::warning file=${currentFile},line=${currentLine++},col=${line.length}` +
-      '::pr-url doesn\'t match the actual PR URL.'
+      '::pr-url doesn\'t match the URL of the current PR.'
     );
   } else if (line[0] !== '-') {
     // Increment line counter if line is not being deleted.