add IVR documentation
fix spelling
update procedure for incall creation
fix spelling in dialplan examples
use lowercase
sed 's/exemple/example/', sed 's/svi/ivr/', minor tweaks
readable ivr documentation that works!
ivr: minor typo fixes
ivr: fix applications case
ivr : associate schedule to incall
reference variable : GV_DIRECTORY_SOUNDS
fix dialplan to correspond to flowchart

timeout goes to invalid extension
ivr: minor fixes
Merge branch 'ivr-explained'