Update the API documentation

 - Minor fixes, typos, version numbers, etc.
 - Followup fix after "Merge Promise Guard with ESNEXT jerryscript-project#4725"
 - Added documentation for the new implemented API functions

JerryScript-DCO-1.0-Signed-off-by: Laszlo Lango laszlo.lango@h-lab.eu

Author: LaszloLango