Docs had incorrectly said the element was named <uses-permission-sdk23> (missing a hyphen in sdk-23). Fixing all references to that element, and renaming the reference page accordingly. A separate CL sets up a redirect from the old page name to the new one. See first comment for doc stage location. Change-Id: I6e675e03f87851d36465a8fdf3de730de524c4a8 bug: 25346975