Correct some docs typos (#11)

PanModal/Animator/PanModalPresentationAnimator.swift

@@ -124,7 +124,7 @@ extension PanModalPresentationAnimator: UIViewControllerAnimatedTransitioning {
     }
 
     /**
-     Perfroms the appropriate animation based on the transition style
+     Performs the appropriate animation based on the transition style
      */
     public func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
         switch transitionStyle {

PanModal/Controller/PanModalPresentationController.swift

@@ -220,7 +220,7 @@ public class PanModalPresentationController: UIPresentationController {
 public extension PanModalPresentationController {
 
     /**
-     Tranisition the PanModalPresentationController
+     Transition the PanModalPresentationController
      to the given presentation state
      */
     public func transition(to state: PresentationState) {
@@ -384,7 +384,7 @@ private extension PanModalPresentationController {
     }
 
     /**
-     Caluclates & stores the layout anchor points & options
+     Calculates & stores the layout anchor points & options
      */
     func configureViewLayout() {
 

PanModal/Presentable/PanModalPresentable+LayoutHelpers.swift

@@ -38,7 +38,7 @@ extension PanModalPresentable where Self: UIViewController {
     }
 
     /**
-     Returns the short form Y postion
+     Returns the short form Y position
 
      - Note: If voiceover is on, the `longFormYPos` is returned.
      We do not support short form when voiceover is on as it would make it difficult for user to navigate.
@@ -55,7 +55,7 @@ extension PanModalPresentable where Self: UIViewController {
     }
 
     /**
-     Returns the long form Y postion
+     Returns the long form Y position
 
      - Note: We cap this value to the max possible height
      to ensure content is not rendered outside of the view bounds