doc: add missing env vars to man page

PR-URL: #43492
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michael Dawson <midawson@redhat.com>
Reviewed-By: Feng Yu <F3n67u@outlook.com>

doc/node.1

@@ -648,6 +648,7 @@ instead of printing to stderr.
 Equivalent to passing
 .Fl -redirect-warnings Ar file
 on the command line.
+.
 .It Ev NODE_REPL_HISTORY Ar file
 Path to the
 .Ar file
@@ -657,6 +658,10 @@ The default path is
 which is overridden by this variable.
 Setting the value to an empty string ("" or " ") will disable persistent REPL history.
 .
+.It Ev NODE_REPL_EXTERNAL_MODULE Ar file
+Path to a Node.js module which will be loaded in place of the built-in REPL.
+Overriding this value to an empty string (`''`) will use the built-in REPL.
+.
 .It Ev NODE_SKIP_PLATFORM_CHECK
 When set to
 .Ar 1 ,
@@ -692,6 +697,9 @@ If
 .Fl -use-openssl-ca
 is enabled, this overrides and sets OpenSSL's file containing trusted certificates.
 .
+.It Ev TZ
+Specify the timezone configuration.
+.
 .It Ev UV_THREADPOOL_SIZE Ar size
 Sets the number of threads used in libuv's threadpool to
 .Ar size .