[CK] Clean up Stream-K remnants in old CK and fix
static_assert in CK Tile (#8595)
## Motivation
This PR is cleans up some Stream-K documentation (e.g., typos, unneeded
docs) and fixes an error in a Stream-K static assert. This PR adds no
new functionality.
## Technical Details
Exact details about the clean-up changes are as follows:
- Removes Stream-K documentation from old CK that were missed in PR
#8141.
- Fixes `static_assert` syntax in Stream-K kernel by adding `constexpr`
to if-else condition and correcting empty message parameter.
- Cleans up some typos in some Doxygen comments in the CK Tile Stream-K
kernel file.
## Test Plan
Ran existing tests locally; no new functionality was added, so no new
tests were added.
## Test Result
Tests passed.
## Submission Checklist
- [x] Look over the contributing guidelines at
https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.
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