Small atf-sh-api mdoc fix

[Nicolas Joly <njoly%pasteur.fr@localhost>]

Hi,

Just a small patch to fix a mdoc macro fix in the NAME section, where
.Fn should be .Nm instead.

Thanks.

-- 
Nicolas Joly

Biological Software and Databanks.
Institut Pasteur, Paris.

#
# old_revision [37e1963710ff086512e8be5d095681e1c93b033f]
#
# patch "atf-sh/atf-sh-api.3"
#  from [2116c37311915d619ae9e43659246b24271ed950]
#    to [838beb1b30c254cbcc79ef981fd3065d1274feae]
#
============================================================
--- atf-sh/atf-sh-api.3 2116c37311915d619ae9e43659246b24271ed950
+++ atf-sh/atf-sh-api.3 838beb1b30c254cbcc79ef981fd3065d1274feae
@@ -48,7 +48,7 @@
 .Nm atf_require_prog ,
 .Nm atf_set ,
 .Nm atf_skip ,
-.Fn atf_test_case
+.Nm atf_test_case
 .Nd POSIX shell API to write ATF-based test programs
 .Sh SYNOPSIS
 .Fn atf_add_test_case "name"