Rework External_APIs.rst
Rework External_APIs.rst

Asnelchristian/documentation,petrjoachim/documentation,coala/documentation,Kevchen/documentation,rhemon/documentation,coala/documentation,cristinabuciu/documentation,coala/documentation,kshitijkg01/documentation,abhishekbundela/documentation,virresh/documentation,ladaradon/documentation,AnishHota/documentation,tamj0rd2/documentation,Akki356/documentation,Warewolf96/documentation,lusy/coala-documentation