[Asterisk-doc] extensions.conf section outline proposal

[Nick Bachmann]

Here's my idea for the extensions.conf outline.  I have a handy tabled
version that has a "why" or "what" for each section that kind of explains
what I was thinking at http://www.not-real.org/~nick/outline.html.
The outline:
   1. Basic Example (Bob, Inc's extensions.conf)
         1. What an extension is
               1. What priorites are
         2. What a context is
         3. What a variable is
   2. Details: Contexts
         1. Importance of Contexts
         2. Linking Contexts
         3. Including Contexts
   3. Deails: Extensions
         1. Special Extensions (i,t,s)
         1. Calling Stuff
               1. SIP
               2. IAX
               3. Zaptel Channels
         2. Common Applications & How to Use Them
               1. Dial
               1. Voicemail
               1. System()
               1. Answer
               2. (etc)
         3. Priorites
               1. n+1
               2. n+100
               3. Voicemail
   4. Variables
   5. Marcos
   6. Alice, Inc.'s extensions.conf
         1. Call center stuff
         2. Music On Hold
         3. Ring multiple extensions
         4. Other IVR stuff
   7. Recipies
         1. Blocking telemarkers
         2. Ex-girlfriend filter
         3. (more)

Hopefully more people will submit their ideas so we can have a nice
bake-off :-).  (May the best outline win!)
Nick