minor styling tweaks

Author: inoryy

book/installation.rst

@@ -174,16 +174,16 @@ If there are any issues, correct them now before moving on.
 
     :: code-block: bash
 
-        app/console doctrine:database:drop --force
-        app/console doctrine:database:create
+        $ app/console doctrine:database:drop --force
+        $ app/console doctrine:database:create
 
     There's no way to configure these defaults inside doctrine, as it tries to be
     as agnostic as possible in terms of enviroment configuration, so only way around it 
     is to configure server level defaults.
 
     Setting UTF8 defaults for MySQL is as simple as adding a few lines to configuration file:
 
-    :: code-block: text
+    :: code-block: ini
 
         [mysqld]
         collation-server = utf8_general_ci