Copyedited installation documentation to make sense to less experienced Xcode users, ensure consistency, remove redundant language, and reflect recent build changes.
Xcode’s static library template comes with the -ObjC linker flag by default. Instead of removing that flag, this change removes the various imperfect workarounds we’ve been using to ensure that private SDK categories link. Given the size decrease in this static library since #2966 was fixed, we should have room to spare for the more straightforward approach. Moreover, an application that uses MGLMapView in a storyboard no longer needs to add -ObjC to the application target, which bloated the entire application, including other frameworks that had no need for -ObjC.
-ObjC isn’t even needed for dynamic frameworks, and the OS X SDK is only built as a dynamic framework.
People are used to dragging frameworks into the Linked Frameworks and Libraries section, but the SDK only works when embedded inside the application.
Fixes#4011.
