[Asterisk-doc] Preferred format for calling Asterisk applications

[Jared Smith]

I talked to Mark Spencer the other day, and he said the preferred format
for calling applications is definitely:

Dial(foo,bar,whizbang)

and NOT:

Dial,foo,bar,whizbang or Dial(foo|bar|whizbang) or something like that.

Let's make sure we make all of the examples in the book follow the
preferred format.  (I'll make a note in the NOTES file.)

Jared