doc: list largepage values in --help

This commit adds the supported --use-largepages values to
the --help menu.

PR-URL: #31537
Fixes: #31533
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Denys Otrishko <shishugi@gmail.com>
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Rich Trott <rtrott@gmail.com>

Author: cjihrig

src/node_options.cc

@@ -807,7 +807,10 @@ PerProcessOptionsParser::PerProcessOptionsParser(
 #endif
 #endif
   AddOption("--use-largepages",
-            "Map the Node.js static code to large pages",
+            "Map the Node.js static code to large pages. Options are "
+            "'off' (the default value, meaning do not map), "
+            "'on' (map and ignore failure, reporting it to stderr), "
+            "or 'silent' (map and silently ignore failure)",
             &PerProcessOptions::use_largepages,
             kAllowedInEnvironment);