bug#56489: Incomplete description of Completion Commands in Emacs Manual an Lisp Reference

[carlmarcos]

I am using completing-read, but am finding it laborious to find information regarding Completion Commands.

In the Emacs Manual there is "8.4.2 Completion Commands" and in the Emacs Lisp Reference Manual there is "21.6.3 Minibuffer Commands that Do Completion".  Although the aforementioned sections do describe the result of using "TAB" and "?" to display the list of completion, I do not think the information is incomplete because one can also move from one completion entry to another using the up and down arrows.