Camera2: Update generated docs to latest version

- Move camera reference doc images to /reference/images
- Minor formatting changes due to merging SDK/NDK metadata definitions
- Minor wording changes for the same

Bug: 69175492
Bug: 29102963
Bug: 33262893
Test: Build and manual inspection of generated docs diff
Change-Id: Ieaf0c1943eba378cc94a22d184734602c40e25e7