doc: remove IRC from man page

PR-URL: #53344
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Moshe Atlow <moshe@atlow.co.il>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Mohammed Keyvanzadeh <mohammadkeyvanzade94@gmail.com>
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>
Reviewed-By: Ulises Gascón <ulisesgascongonzalez@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

doc/node.1

@@ -812,8 +812,3 @@ Documentation:
 .Pp
 GitHub repository and issue tracker:
 .Sy https://github.com/nodejs/node
-.
-.Pp
-IRC (general questions):
-.Sy "libera.chat #node.js"
-(unofficial)