bug#25612: 26.0.50; Slightly suboptimal message for disabled commands

[Eli Zaretskii]

> From: Philipp Stephani <p.stephani2@gmail.com>
> Date: Fri, 03 Feb 2017 13:34:09 +0100
> 
> Run M-x erase-buffer.  The *Disabled Command* buffer that shows up
> contains
> 
>   You have typed RET, invoking disabled command erase-buffer.
> 
> This should rather be
> 
>   You have typed M-x erase-buffer RET, invoking disabled command
>   erase-buffer.
> 
> The RET alone of course didn't invoke the command, it just happens to be
> the last keystroke, so this message might be somewhat confusing.

Depending on your POV, it could be argued that RET is the one that
actually invoked the command.

Perhaps the message should avoid showing the key sequence at all?