doc: add --enable-source-maps man page entry

This commit adds the --enable-source-maps CLI flag to the
man page.

PR-URL: #31077
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Beth Griggs <Bethany.Griggs@uk.ibm.com>
Reviewed-By: Anto Aravinth <anto.aravinth.cse@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

doc/node.1

@@ -110,6 +110,9 @@ Enable FIPS-compliant crypto at startup.
 Requires Node.js to be built with
 .Sy ./configure --openssl-fips .
 .
+.It Fl -enable-source-maps
+Enable experimental Source Map V3 support for stack traces.
+.
 .It Fl -experimental-conditional-exports
 Enable experimental support for "require" and "node" conditional export targets.
 .