doc: change "Version 4 UUID" to "version 4 UUID"

Refs: https://www.rfc-editor.org/rfc/rfc4122.txt

PR-URL: #39682
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Beth Griggs <bgriggs@redhat.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>

Author: tniessen

doc/api/crypto.md

@@ -2855,7 +2855,7 @@ added: v14.17.0
     `disableEntropyCache` to `true`. **Defaults**: `false`.
 * Returns: {string}
 
-Generates a random [RFC 4122][] Version 4 UUID. The UUID is generated using a
+Generates a random [RFC 4122][] version 4 UUID. The UUID is generated using a
 cryptographic pseudorandom number generator.
 
 ### `crypto.scrypt(password, salt, keylen[, options], callback)`