gh-95233: Correct grp.getgrgid parameter name in documentation (gid -> id) (gh-95232)

(cherry picked from commit df7c8b95372169fb9d23140d35f91970ba32189d)

Co-authored-by: Adam Dangoor <adamdangoor@gmail.com>
diff --git a/Doc/library/grp.rst b/Doc/library/grp.rst
index fbfb922..baa3175 100644
--- a/Doc/library/grp.rst
+++ b/Doc/library/grp.rst
@@ -38,7 +38,7 @@
 It defines the following items:
 
 
-.. function:: getgrgid(gid)
+.. function:: getgrgid(id)
 
    Return the group database entry for the given numeric group ID. :exc:`KeyError`
    is raised if the entry asked for cannot be found.