Add "local" mode to ‘--mode help’ command description (mitmproxy#7976) (mitmproxy#7977)

* Add 'local' to --mode help text

* Fix whitespace nit

* Fix spacing in mode help text

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Co-authored-by: rohahann-tech <rohahann@gmail.com>

Author: Rohankaf

mitmproxy/options.py

@@ -111,7 +111,7 @@ def __init__(self, **kwargs) -> None:
             """
             The proxy server type(s) to spawn. Can be passed multiple times.
 
-            Mitmproxy supports "regular" (HTTP), "transparent", "socks5", "reverse:SPEC",
+            Mitmproxy supports "regular" (HTTP), "local", "transparent", "socks5", "reverse:SPEC",
             "upstream:SPEC", and "wireguard[:PATH]" proxy servers. For reverse and upstream proxy modes, SPEC
             is host specification in the form of "http[s]://host[:port]". For WireGuard mode, PATH may point to
             a file containing key material. If no such file exists, it will be created on startup.