Fix human-readable text in Azure provider (#1384)
Fix human-readable text in Azure provider (#1384)

* capitalisation of JSON

* long exception string literal contained long strings of
  whitespace due to indentation - change string literal
  syntax to one which avoids that

* make markup and articles consistent

* remove a duplicate comment
Parsl/parsl,Parsl/parsl,Parsl/parsl,Parsl/parsl