Update cheatsheets

linux/groupmod

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# groupmod
+
+> Modify existing user groups in the system.
+> See also: `groups`, `groupadd`, `groupdel`.
+> More information: <https://manned.org/groupmod>.
+
+- Change the group name:
+
+`sudo groupmod --new-name {{new_group}} {{group_name}}`
+
+- Change the group id:
+
+`sudo groupmod --gid {{new_id}} {{group_name}}`