info-lookup-symbol

info-lookup-symbol is an interactive autoloaded compiled Lisp function in `info-look.el'.

It is bound to C-h S, <f1> S, <help> S.

(info-lookup-symbol SYMBOL &optional MODE)

Display the definition of SYMBOL, as found in the relevant manual.
When this command is called interactively, it reads SYMBOL from the
minibuffer. In the minibuffer, use M-n to yank the default argument
value into the minibuffer so you can edit it. The default symbol is the
one found at point.

With prefix arg MODE a query for the symbol help mode is offered.