test: clean up comments in test-url-format

test-url-format has the max-len rule disabled by a comment but doesn't
have any lines that violate the max-len lint rule. Remove the comment.

Reformat other comments for capitalization, punctuation, and updated
URLs.

PR-URL: https://github.com/nodejs/node/pull/11679


Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com>