bug#43954: make org speed commands friendlier [CODE INCLUDED]

[Boruch Baum]

When POINT is on the first column of an org-heading, org-mode makes
available a set of 'speed-commands'. One of those commands is a
keybinding cheatsheet, M-x org-speed-command-help, bound to '?'.
However, that cheatsheet only maps keybindings to function names, so it
often isn't helpful (certainly not for new-comers).

The entries should present the first line of the functions' docstrings,
maybe without the function name even appearing at all, and possibly a
link to a describe-function help buffer.

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