The tutorial in Documentation/MyFirstContribution.txt has steps to print
some text using the "_" function. However, this leads to compiler errors
when running "make" since "gettext.h" is not #included.
Update docs with a note to #include "gettext.h" in "builtin/psuh.c".
Signed-off-by: Jacob Stopak <jacob@initialcommit.io> Reviewed-by: Emily Shaffer <nasamuffin@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>