Improve gem release instructions

Rakefile

@@ -67,11 +67,11 @@ task :release, [:version_bump] do |_t, args|
     Run the following commands:
 
     1. Push commit and tag to Github:
-        $ git push origin && git push origin --tags
+        git push origin && git push origin --tags
     2. Push to Rubygems.org:
-        $ gem release
+        gem release
     3. Author a Github Release:
-        https://github.com/bensheldon/good_job/releases/new?tag=v#{GoodJob::VERSION}&body=#{CGI.escape "[Changelog](#{changelog_url})"}
+        https://github.com/bensheldon/good_job/releases/new?tag=v#{GoodJob::VERSION}&body=#{CGI.escape "_Review the [Changelog](#{changelog_url}) for more details._"}
   INSTRUCTIONS
 end