Refactor/nit main.py: rename the variable other_group to misc_group (#19832)

This better reflects its external name, "Miscellaneous".

The current CI suffices to check that this code is correct.

Author: wyattscarpenter

mypy/main.py

@@ -1163,22 +1163,22 @@ def add_invertible_flag(
         "--skip-c-gen", dest="mypyc_skip_c_generation", action="store_true", help=argparse.SUPPRESS
     )
 
-    other_group = parser.add_argument_group(title="Miscellaneous")
-    other_group.add_argument("--quickstart-file", help=argparse.SUPPRESS)
-    other_group.add_argument("--junit-xml", help="Write junit.xml to the given file")
+    misc_group = parser.add_argument_group(title="Miscellaneous")
+    misc_group.add_argument("--quickstart-file", help=argparse.SUPPRESS)
+    misc_group.add_argument("--junit-xml", help="Write junit.xml to the given file")
     imports_group.add_argument(
         "--junit-format",
         choices=["global", "per_file"],
         default="global",
         help="If --junit-xml is set, specifies format. global: single test with all errors; per_file: one test entry per file with failures",
     )
-    other_group.add_argument(
+    misc_group.add_argument(
         "--find-occurrences",
         metavar="CLASS.MEMBER",
         dest="special-opts:find_occurrences",
         help="Print out all usages of a class member (experimental)",
     )
-    other_group.add_argument(
+    misc_group.add_argument(
         "--scripts-are-modules",
         action="store_true",
         help="Script x becomes module x instead of __main__",
@@ -1189,7 +1189,7 @@ def add_invertible_flag(
         default=False,
         strict_flag=False,
         help="Install detected missing library stub packages using pip",
-        group=other_group,
+        group=misc_group,
     )
     add_invertible_flag(
         "--non-interactive",
@@ -1199,12 +1199,12 @@ def add_invertible_flag(
             "Install stubs without asking for confirmation and hide "
             + "errors, with --install-types"
         ),
-        group=other_group,
+        group=misc_group,
         inverse="--interactive",
     )
 
     if server_options:
-        other_group.add_argument(
+        misc_group.add_argument(
             "--use-fine-grained-cache",
             action="store_true",
             help="Use the cache in fine-grained incremental mode",