[ios] Update cancel tracking documentation.

platform/ios/CHANGELOG.md

@@ -42,6 +42,7 @@ Mapbox welcomes participation and contributions from everyone. Please read [CONT
 * Fixed an issue preventing the Mapbox Telemetry confirmation dialog from appearing when opened from within a map view in a modal view controller. ([#9027](https://github.com/mapbox/mapbox-gl-native/pull/9027))
 * Corrected the size of MGLMapView’s compass. ([#9060](https://github.com/mapbox/mapbox-gl-native/pull/9060))
 * The Improve This Map button in the attribution action sheet now leads to a feedback tool that matches MGLMapView’s rotation and pitch. `-[MGLAttributionInfo feedbackURLAtCenterCoordinate:zoomLevel:]` no longer respects the feedback URL specified in TileJSON. ([#9078](https://github.com/mapbox/mapbox-gl-native/pull/9078))
+* Fixed an issue when user starts tracking position and stops manually the animation. ([#7916](https://github.com/mapbox/mapbox-gl-native/pull/7916))
 
 ### Other changes
 
@@ -51,7 +52,6 @@ Mapbox welcomes participation and contributions from everyone. Please read [CONT
 * The error passed into `-[MGLMapViewDelegate mapViewDidFailLoadingMap:withError:]` now includes a more specific description and failure reason. ([#8418](https://github.com/mapbox/mapbox-gl-native/pull/8418))
 * Improved CPU and battery performance while animating a tilted map’s camera in an area with many labels. ([#9031](https://github.com/mapbox/mapbox-gl-native/pull/9031))
 * Fixed an issue rendering polylines that contain duplicate vertices. ([#8808](https://github.com/mapbox/mapbox-gl-native/pull/8808))
-* Fixed an issue when user starts tracking position and stops manually the animation ([#7916](https://github.com/mapbox/mapbox-gl-native/pull/7916))
 
 ## 3.5.4 - May 9, 2017
 

platform/ios/src/MGLMapView.mm

@@ -84,7 +84,7 @@ typedef NS_ENUM(NSUInteger, MGLUserTrackingState) {
     MGLUserTrackingStatePossible = 0,
     /// The map view has begun to move to the first reported user location.
     MGLUserTrackingStateBegan,
-    /// The map view has begun to move to
+    /// The map view begins a significant transition.
     MGLUserTrackingStateBeginSignificantTransition,
     /// The map view has finished moving to the first reported user location.
     MGLUserTrackingStateChanged,
@@ -114,7 +114,7 @@ typedef NS_ENUM(NSUInteger, MGLUserTrackingState) {
 /// Tolerance for snapping to true north, measured in degrees in either direction.
 const CLLocationDirection MGLToleranceForSnappingToNorth = 7;
 
-/// Distance threshold
+/// Distance threshold to stop the camera while animating.
 const CLLocationDistance MGLDistanceThresholdForCameraPause = 500;
 
 /// Reuse identifier and file name of the default point annotation image.