yesod: tweak main description (#1362)

pages/common/yesod.md

@@ -1,9 +1,9 @@
 # yesod
 
-> A framework to develop Haskell web applications.
-> All yesod commands are invoked through the `stack` project manager.
+> Helper tool for Yesod, a Haskell-based web framework.
+> All Yesod commands are invoked through the `stack` project manager.
 
-- Create a new scaffolded site with sqlite as backend in `my-project` directory:
+- Create a new scaffolded site, with sqlite as backend, in the "my-project" directory:
 
 `stack new {{my-project}} {{yesod-sqlite}}`