Remove extra #### from docs (#891)

Looks like there was an extra (accidental?) Markdown H4 alongside italics on line 246. Updated to reflect the way the rest of the doc is formatted with "this should" statements.

Author: mikedory

docs/Auth-with-Ionic2.md

@@ -243,7 +243,7 @@ C:\projects\Ionic_AngularFire2_Project> ionic serve
 
 ```
 
-####_This should fetch the data from firebase._
+This should fetch the data from firebase.
 
 ## Configuring AngularFire2 Auth with Ionic2