[MaskedTransition] Fix typo (material-components#7541)

There was a typo in material-components#7519. This PR fixes it, as well as some other occurrences of the same typo.

Author: andrewoverton

components/Dialogs/examples/DialogsCustomShadowExampleViewController.swift

@@ -32,7 +32,7 @@ class CustomShadowViewController: UIViewController {
     // Setting the corner radius of the view's layer will propagate to the shadow
     // layer when the view is presented by MDCDailogPresentationController.
     // Note that setting the corner radius in viewDidLoad is not recommended, since it
-    // will be overriden if callers apply a themer to the MDCDailogPresentationController instance.
+    // will be overridden if callers apply a themer to the MDCDailogPresentationController instance.
     self.view.layer.cornerRadius = 32.0
 
     bodyLabel.text =

components/Dialogs/src/MDCAlertController.m

@@ -399,7 +399,7 @@ - (void)setupAlertView {
     [self addButtonToAlertViewForAction:action];
   }
   // Explicitly overwrite the view default if true
-  // We set this last to make sure all other properties are set first and no overriden by setting
+  // We set this last to make sure all other properties are set first and no overridden by setting
   // this.
   if (self.mdc_adjustsFontForContentSizeCategory) {
     self.alertView.mdc_adjustsFontForContentSizeCategory = YES;

components/MaskedTransition/src/MDCMaskedTransitionController.h

@@ -63,7 +63,7 @@
  `UIModalPresentationCustom` in order to use this property.
 
  Avoid calling -frameOfPresentedViewInContainerView on the UIPresentationController parameter of
- this block, because this block is called from an overriden implementation of that method that
+ this block, because this block is called from an overridden implementation of that method that
  passes self in as a parameter, and doing this can result in an infinite loop.
  */
 @property(nonatomic, copy, nullable) CGRect (^calculateFrameOfPresentedView)