Improve 2012/grothe/try.sh + other minor fixes

The try section in the README.md file did not refer to the script.

The URL in the cookie recipe file was updated to refer to the domain
that the old one redirects to just in case the old one ever expires or
no longer redirects to the more recent domain. The thanks file notes
this for reference as an aside for context and historical purposes,
noting both URLs.

2012/grothe/cookie_recipe.txt

@@ -2,7 +2,7 @@ This is based on the Urban Legend about Neiman Marcus charging $25,000 for
 their cookie recipe.  No one knows the source, but the recipe does make good 
 cookies and a LOT of them.  Recipe is in Public Domain.
 
-From Steve's Recipe Database http://recipes.stevex.net/
+From Steve's Recipe Database https://www.mealsteps.com.
 
 Title: $25,000 Cookies
 Yield: 112 Servings