test: remove outdated documentation

As noted by @richardlau, `Makefile` and `vcbuild.bat` no longer need to
be updated since they run the `default` suite.

PR-URL: https://github.com/nodejs/node/pull/22009


Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>