strace.1.in: try to be more clear with -e trace=class deprecation notice

strace.1.in: try to be more clear with -e trace=class deprecation notice

It was reported that the current way of labelling of the percent-less
-e trace=class syntax variant may be confusing, as it can be read
as deprecation of the whole option and not specific syntax; try to be
more clear by moving the deprecation notices into the option
descriptions.

* strace.1.in (.SS Filtering): Move the deprecation notice
of -e trace={file,process,network,signal,ipc,desc,memory} syntax
to the descriptions of the respective options.

Reported-by: Alexey Gladkov <gladkov.alexey@gmail.com>