add examples to "help let"

[Dan Jacobson]

I'd say add some examples to
$ help let
if you really want it to be helpful.

Let's look at what even me, former shell powder user, did while trying
to learn from help let:

$ let x = 5
$ help let
$ help let|s
$ let 37 % 12
$ help let
$ let 37 + 12
$ let 1
$ let 1 1
$ let 1 + 1
$ expr
$ help expr #and why not?
$ man expr
$ z=((3+2))
$ z=$((3+2)) #finally gets nack
$ let 3+2
$ let m=3+4
$ echo $m

Don't worry about me... I just think each "help" item needs and
example to get folks off and running... or else they won't know what
you're talking about.
-- 
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Stay off the powder.