Documentation touchup

[skyreflectedinmirrors]

1. Apply trademarks / proper verbiage for the MI Instinct accelerators
2. Use "shell-session" to avoid 'failed to lex' errors
3. Enable use of (tm) w/ myst replacements: https://myst-parser.readthedocs.io/en/latest/syntax/optional.html
4. Various clean-up / clarifications (review feedback from unfamiliar readers)

[skyreflectedinmirrors]

ping @coleramos425 @koomie

[koomie]

Thanks for the ping. I'm on it.

[koomie]

Final note - I went ahead and cherry-picked these onto main so the changes are live now on the published docs.

Long live the :tm:.