doc: hint about GIT_DEBUGGER in CodingGuidelines
We check for a handy environment variable GIT_DEBUGGER when running via bin-wrappers/, but this feature is undocumented. Add a hint to how to use it into the CodingGuidelines (which is where other useful environment settings like DEVELOPER are documented). Signed-off-by: NEmily Shaffer <emilyshaffer@google.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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