Merge pull request #5233 from mihails-strasuns-sociomantic/dlang-twea…

…k-v2-msg

[D1] clarify help string for `-v2` flag

src/mars.c

@@ -405,10 +405,10 @@ Usage:\n\
   -unittest      compile in unit tests\n\
   -v             verbose\n\
   -v1            D language version 1\n\
-  -v2            give hints for converting to D2 (default hint set)\n\
+  -v2            give hints for converting to D2 (enables all hints)\n\
   -v2=XXX        enable the specific XXX conversion hint type\n\
   -v2=-XXX       disable the specific XXX conversion hint type\n\
-                 (if -v2 wasn't enable already, the defaults are enabled first)\n\
+                 (if -v2 wasn't enabled already, all other hints will become enabled first)\n\
   -v2-list       list all available conversion hint types\n\
   -version=level compile in version code >= level\n\
   -version=ident compile in version code identified by ident\n\