bug#18113: Ambiguity in etc/DEBUG

[Alan Mackenzie]

Hi, Emacs.

In etc/DEBUG is written:

    When you debug Emacs with GDB, you should start it in the directory
    where the executable was made (the 'src' directory in the Emacs source
    tree).  That directory has a .gdbinit file that defines various
    "user-defined" commands for debugging Emacs.

It is unclear to me whether the "it" that should be starting in src is
Emacs or gdb itself.  I think that "it" should be replaced by either
"Emacs" or "GDB".

-- 
Alan Mackenzie (Nuremberg, Germany).