doc: additional note in README(.md) informing users that it is advise…

…d to import the full set of trusted release keys (rather than an individual key) (reconciled with another suggestion from code review)

The OP finds his original suggestion more descriptive & more user-friendly, but prefers to move on since that suggestion is stalled in favor of much shorter verbiage. This version also splits the line at 80 characters to comply with lint-md.

Co-Authored-By: Myles Borins <mylesborins@google.com>

Fixes: nodejs#32559

README.md

@@ -565,7 +565,8 @@ GPG keys used to sign Node.js releases:
 * **Shelley Vohr** <shelley.vohr@gmail.com>
 `B9E2F5981AA6E0CD28160D9FF13993A75599653C`
 
-To import the full set of trusted release keys (including subkeys possibly used to sign releases):
+To import the full set of trusted release keys (including subkeys possibly used
+to sign releases):
 
 ```shell
 gpg --keyserver pool.sks-keyservers.net --recv-keys 4ED778F539E3634C779C87C6D7062848A1AB005C