shell: Rewrite documentation and improve error message
Update the documentation of 'git shell' to mention the interactive mode and COMMAND_DIR. Also provide a hint when interactive mode is not available in the shell. Signed-off-by: NRamkumar Ramachandra <artagnon@gmail.com> Reviewed-by: NGreg Brockman <gdb@MIT.EDU> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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