Slightly tweaked docs on supplying your own main

docs/own-main.md

@@ -41,6 +41,7 @@ int main( int argc, char* const argv[] )
   Catch::Session session; // There must be exactly once instance
 
   // writing to session.configData() here sets defaults
+  // this is the preferred way to set them
 
   int returnCode = session.applyCommandLine( argc, argv );
   if( returnCode != 0 ) // Indicates a command line error
@@ -48,6 +49,7 @@ int main( int argc, char* const argv[] )
 
   // writing to session.configData() or session.Config() here 
   // overrides command line args
+  // only do this if you know you need to
 
   return session.run();
 }