CANN: update docker images to 8.5.0 and improve CANN.md (#20801)

* cann: update docker images to 8.5.0

- bump CANN base image from 8.3.rc2 to 8.5.0
- bump ASCEND_VERSION from 8.1.RC1.alpha001 to 8.5.0

Move to newer stable releases.

* cann: update CANN.md

* Update CANN.md to include BF16 support

Added BF16 support information to the CANN documentation and corrected formatting for the installation instructions.

* Fix formatting issues in CANN.md

Fix 234: Trailing whitespace