* Adopt terminal suggest to shell api change
* Internally bring string enum for terminal suggest to prevent Typos
* Better word description under api description
* Remove shell proposed api against vscode.d.ts
* Update `shell` description after looking at feedbacks.
* Update docs
* Change to a Map<TerminalShellTye, string[]>
* One last typo
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Co-authored-by: Daniel Imms <2193314+Tyriar@users.noreply.github.com>