[Docs] Update mobile docs for 1.9 (#9237)
* Edgchen1/objc api reference 1.9 (#1)
* Update Objective-C API reference for 1.9.
* Update spelling.
* Test link changes.
* Fix links.
* Fix links and updates in mobile-performance-tuning.md.
* Fix links in tutorials/mobile/custom-build.md.
* Fix
* Fix
* Fix links in docs/tutorials/mobile/initial-setup.md.
* Fix links.
* Update note.
* Add 1.9 op type support page.
* Add nav info to page.
* Rename files to not have spaces.
