Clarify the second argument usage for "c-fix"-es.

From-SVN: r131549

fixincludes/README

@@ -229,11 +229,12 @@ MAKING CHANGES TO INCLHACK.DEF
             c_fix_arg = "#ifndef %1\n%0\n#endif";
             c_fix_arg = "#define[ \t]+([A-Z][A-Z0-9a-z_]*).*";
 
-        This would wrap a traditional #define inside of a "#ifndef"/"#endif"
-        pair.  The second "c_fix_arg" may be omitted *IF* there is
-        a select clause and the first one matches the text you want
-        replaced.  You may delete text by supplying an empty string for
-        the format (the first "c_fix_arg").
+        This would wrap a one line #define inside of a "#ifndef"/"#endif"
+        pair.  The second "c_fix_arg" may be omitted *IF* there is a select
+        clause and the first one identifies the text you wish to reformat.
+        It will then be used as the second "c_fix_arg".  You may delete the
+        selected text by supplying an empty string for the format (the first
+        "c_fix_arg").
 
 	Note: In general, a format c_fix may be used in place of one
 	sed expression.  However, it will need to be rewritten by