[Patch docs 2/5] Update "Instruction Patterns" in md.texi

[Richard Sandiford]

James Greenhalgh <james.greenhalgh@arm.com> writes:
>  @node Example
>  @section Example of @code{define_insn}
>  @cindex @code{define_insn} example
>  
> -Here is an actual example of an instruction pattern, for the 68000/68020.
> +Here is an example of an instruction pattern, taken from the machine
> +description for the 68000/68020.
>  
>  @smallexample
>  (define_insn "tstsi"

Might be mission creep again, but: tstsi is no longer a named pattern.
Maybe we should put something more modern in there...

Thanks,
Richard