Updated mirror audit problem message

Library/Homebrew/dev-cmd/audit.rb

@@ -1494,15 +1494,15 @@ class ResourceAuditor
         status_code, _, _ = curl_output "--connect-timeout", "15", "--output", "/dev/null", "--range", "0-0", \
                                         "--write-out", "%{http_code}", url
         unless status_code.start_with? "20"
-          problem "The mirror #{url} is not reachable (HTTP status code #{status_code})"
+          problem "The URL #{url} is not reachable (HTTP status code #{status_code})"
         end
       elsif url.start_with? "git"
         unless Utils.git_remote_exists url
-          problem "The mirror #{url} is not a valid git URL"
+          problem "The URL #{url} is not a valid git URL"
         end
       elsif url.start_with? "svn"
         unless Utils.svn_remote_exists url
-          problem "The mirror #{url} is not a valid svn URL"
+          problem "The URL #{url} is not a valid svn URL"
         end
       end
       check_insecure_mirror(url) if url.start_with? "http:"