fix typos using misspell

Author: Lutzifer

README.md

@@ -16,7 +16,7 @@ In a networked application a view controller or custom view typically has the fo
 * **Loading**: The content is currently loaded over the network.
 * **Content**: The content is available and presented to the user.
 * **Empty**: There is currently no content available to display.
-* **Error**: An error occured whilst downloading content.
+* **Error**: An error occurred whilst downloading content.
 
 As trivial as this flow may sound, there are a lot of cases that result in a rather large decision tree.
 

StatefulViewController/StatefulViewController.swift

@@ -57,18 +57,18 @@ public protocol StatefulViewController: class, BackingViewProvider {
     func startLoading(animated: Bool, completion: (() -> Void)?)
 
     /// Ends the controller's loading state.
-    /// If an error occured, the error view is shown.
+    /// If an error occurred, the error view is shown.
     /// If the `hasContent` method returns false after calling this method, the empty view is shown.
     ///
     /// - parameter animated: 	true if the switch to the placeholder view should be animated, false otherwise
-    /// - parameter error:		An error that might have occured whilst loading
+    /// - parameter error:		An error that might have occurred whilst loading
     func endLoading(animated: Bool, error: Error?, completion: (() -> Void)?)
 
     /// Transitions the view to the appropriate state based on the `loading` and `error`
     /// input parameters and shows/hides corresponding placeholder views.
     ///
     /// - parameter loading:		true if the controller is currently loading
-    /// - parameter error:		An error that might have occured whilst loading
+    /// - parameter error:		An error that might have occurred whilst loading
     /// - parameter animated:	true if the switch to the placeholder view should be animated, false otherwise
     func transitionViewStates(loading: Bool, error: Error?, animated: Bool, completion: (() -> Void)?)
 
@@ -80,10 +80,10 @@ public protocol StatefulViewController: class, BackingViewProvider {
     /// - returns: true if there is content available in your controller.
     func hasContent() -> Bool
 
-    /// This method is called if an error occured, but `hasContent` returned true.
+    /// This method is called if an error occurred, but `hasContent` returned true.
     /// You would typically display an unobstrusive error message that is easily dismissable
     /// for the user to continue browsing content.
     ///
-    /// - parameter error:	The error that occured
+    /// - parameter error:	The error that occurred
     func handleErrorWhenContentAvailable(_ error: Error)
 }