fix: fix warning by removing old Ti.UI.iOS.SystemButtonStyle API

Author: hansemannn

docs/.vuepress/api.json

@@ -287,7 +287,6 @@
 							["titanium/ui/ios/statusbar", "StatusBar"],
 							["titanium/ui/ios/stepper", "Stepper"],
 							["titanium/ui/ios/systembutton", "SystemButton"],
-							["titanium/ui/ios/systembuttonstyle", "SystemButtonStyle"],
 							["titanium/ui/ios/systemicon", "SystemIcon"],
 							["titanium/ui/ios/tabbedbar", "TabbedBar"],
 							["titanium/ui/ios/tableviewcellselectionstyle", "TableViewCellSelectionStyle"],

docs/guide/Alloy_Framework/Alloy_Guide/Alloy_Controllers.md

@@ -135,8 +135,7 @@ For example, since iOS devices do not include a back button, the application can
 ```javascript
 if (OS_IOS) {
   var closeButton = Ti.UI.createButton({
-        title: 'Close',
-        style: Ti.UI.iPhone.SystemButtonStyle.PLAIN
+        title: 'Close'
     });
 
     closeButton.addEventListener('click', function(){

docs/guide/Titanium_SDK/Titanium_SDK_How-tos/Location_Services/Native_Maps_and_Annotations.md

@@ -256,7 +256,7 @@ As we can see, there's many `Annotation` properties available for styling and in
 
 * `image` - The URL to an image to be used in place of the default pin image
 
-* `leftButton` - A button that will appear on the left side of your annotation when clicked. This property must have a value equal to the URL of an image, or to a `Ti.UI.iPhone.SystemButtonStyle` constant.
+* `leftButton` - A button that will appear on the left side of your annotation when clicked. This property must have a value equal to the URL of an image, or to a `Ti.UI.iOS.SystemButton` constant.
 
 * `leftView` - A Titanium View object that will appear on the left side of your annotation when clicked. This property can be a single view like a `Ti.UI.Button` or `Ti.UI.Label`, or it can be a hierarchy of views.