   end
 
   @doc """
-  An array of category names for this email. A maximum of 10 categories can be assigned to an email.
-  Duplicate categories will be ignored and only unique entries will be sent.
+  Sets a list of categories for this email. 
+
+  A maximum of 10 categories can be assigned to an email. Duplicate categories will 
+  be ignored and only unique entries will be sent.
 
   ## Example
 


  @doc """
  Instruct SendGrid to enable or disable Google Analytics tracking, and
  optionally set the UTM parameters for it. This is useful if you need to
  control UTM tracking parameters on an individual email basis.

  ## Example


    do: raise("expected the name parameter to be of type binary or atom, got #{field}")

  @doc """
  Set the ASM (Advanced Suppression Manager) group that this email should belong to.

  This can be used to let recipients unsubscribe from only a certain type of communication.

  ## Example
