docs(refresher): adding documentation for refresher changes (#4397)

Author: ShaneK

.gitignore

@@ -22,3 +22,4 @@ yarn-debug.log*
 yarn-error.log*
 
 static/**/node_modules/
+.idea

docs/api/refresher.md

@@ -113,6 +113,14 @@ interface RefresherEventDetail {
 }
 ```
 
+### RefresherPullEndEventDetail
+
+```typescript
+interface RefresherPullEndEventDetail {
+  reason: 'complete' | 'cancel';
+}
+```
+
 ### RefresherCustomEvent
 
 While not required, this interface can be used in place of the `CustomEvent` interface for stronger typing with Ionic events emitted from this component.
@@ -124,6 +132,17 @@ interface RefresherCustomEvent extends CustomEvent {
 }
 ```
 
+### RefresherPullEndCustomEvent
+
+While not required, this interface can be used in place of the `CustomEvent` interface for stronger typing with the `ionPullEnd` event.
+
+```typescript
+interface RefresherPullEndCustomEvent extends CustomEvent {
+  detail: RefresherPullEndEventDetail;
+  target: HTMLIonRefresherElement;
+}
+```
+
 ## Properties
 <Props />