[ios] moved changes to darwin (#9387)

Author: jmkiley

platform/darwin/docs/guides/For Style Authors.md.ejs

@@ -121,6 +121,8 @@ for ink economy before printing the map view.
 <% if (iOS) { -%>
 For more information about user interface design, consult Apple’s
 [_iOS Human Interface Guidelines_](https://developer.apple.com/ios/human-interface-guidelines/).
+To learn more about designing maps for mobile devices, see [Nathaniel Slaughter's blog post](https://www.mapbox.com/blog/designing-maps-for-mobile-devices/) on
+the subject.
 <% } else { -%>
 For more information about user interface design, consult Apple’s
 [_macOS Human Interface Guidelines_](https://developer.apple.com/library/content/documentation/UserExperience/Conceptual/OSXHIGuidelines/).

platform/ios/docs/guides/For Style Authors.md

@@ -76,6 +76,8 @@ gestures.
 
 For more information about user interface design, consult Apple’s
 [_iOS Human Interface Guidelines_](https://developer.apple.com/ios/human-interface-guidelines/).
+To learn more about designing maps for mobile devices, see [Nathaniel Slaughter's blog post](https://www.mapbox.com/blog/designing-maps-for-mobile-devices/) on
+the subject.
 
 ## Applying your style