Update hiding_dashboards_from_sidebar.md

Fixes the typo and adds some basic formatting.

docs/guides/hiding_dashboards_from_sidebar.md

@@ -2,7 +2,7 @@
 title: Hiding Dashboards from the Sidebar
 ---
 
-Resources can be removed form the sidebar by removing their index action from the routes. For example:
+Resources can be removed from the sidebar by removing their `index` action from the routes. For example:
 
 ```ruby
 # config/routes.rb
@@ -16,4 +16,4 @@ Rails.application.routes.draw do
 end
 ```
 
-In this case, only Orders and Products will appear in the sidebar, while Line Items can still appear as an association.
+In this case, only `Orders` and `Products` will appear in the sidebar, while `Line Items` can still appear as an association.