some cleanup

src/lib/libutil/pw_getconf.3

@@ -39,8 +39,9 @@
 .Sh DESCRIPTION
 The
 .Fn pw_getconf
-function access the passwd.conf file and retrieves the value of the 
-option specified
+function reads
+.Pa /etc/passwd.conf
+and retrieves the value of the option specified
 by 
 .Pa option
 from the section given be 
@@ -49,7 +50,7 @@ If no suitable entry is found
 for the 
 .Pa key
 a default value or an empty string will be returned in data. 
-An empty string gets also returned on error.
+An empty string is also returned for other errors.
 .Sh FILES
 .Bl -tag -width /etc/passwd.conf -compact
 .It Pa /etc/passwd.conf