[Feature Request] Ability to open CLI documentation directly from the shell

Sometimes you really need to go check the online documentation for the commands you are trying to run. Having a native shortcut to open the browser with the relevant page would be a good feature addition to this great tool.

For example s3 ls help or s3 ls docu should open the S3 ls cli page in the browser.

Thanks

The issue names the shell examples `s3 ls help` and `s3 ls docu`, but it does not identify files, tests, or an entry point. Start by locating the command parsing and help-handling code, then determine how AWS CLI commands map to online documentation. Done means a documented shell shortcut opens the relevant S3 command page in a browser.

Written by the indexing model from the issue text.