Fix spelling mistakes in guides

Author: Flo0807

guides/about/what-is-backpex.md

@@ -6,4 +6,4 @@ Backpex is built on top of Phoenix LiveView and provides a rich set of features
 
 Whether you want to quickly scaffold CRUD views for your existing data or build a full-fledged administration panel, Backpex has you covered.
 
-TODO: add screenshots of key features here
+

guides/authorization/live-resource-authorization.md

@@ -4,7 +4,7 @@ You are able to define authorization rules for your resources. The authorization
 
 ## Configuration
 
-To define authorization rules for a resource, you need to implement the [`can/3`](Backpex.LiveResource.html#c:can?/3) callback in the resource configuration file.
+To define authorization rules for a resource, you need to implement the [`can?/3`](Backpex.LiveResource.html#c:can?/3) callback in the resource configuration file.
 
 ```elixir
 # in your resource configuration file
@@ -22,14 +22,14 @@ def can?(assigns, :show, item) do
     user = assigns.current_user
 
     item.user_id == user.id
-end‚
+end
 
 def can?(assigns, action, item), do: true
 ```
 
 The example above will deny access to the `show` action if the `user_id` of the item does not match the `id` of the current user.
 
-You can also use [`can/3`](Backpex.LiveResource.html#c:can?/3) to restrict access to item or resource actions.
+You can also use [`can?/3`](Backpex.LiveResource.html#c:can?/3) to restrict access to item or resource actions.
 
 ```elixir
 # in your resource configuration file

guides/fields/custom-alias.md

@@ -6,7 +6,6 @@ Backpex automatically generates aliases for queries in your fields. However, if
 
 To use a custom alias, define the `custom_alias` key in your field configuration. The value of the `custom_alias` key must be a unique atom that is not already in use by another field.
 
-
 ```elixir
 @impl Backpex.LiveResource
 def fields do