slightly change quickmimic() sense wording

slightly change quickmimic() sense wording

 Changes to be committed:
	modified:   doc/fixes36.1
	modified:   src/dogmove.c

A bug reporter wrote:
> comments:
> "You sense a little dog appear where Poes was!"
>
> seems strange to me, perhaps it should be "appearing", or the hero shouldn't
> notice at all if it's out of sight.
>
> Not sure it was out of sight, anyway, because I saw the d from the shop
> doorway.
>

Change the wording to:
"You sense that a little dog has appeared where Poes was!"