message: Added doc for Name key option
diff: @@ -589,6 +589,7 @@ PYBIND11_MODULE(adios2, m)
  keys
  list of variable information keys to be extracted (case insensitive)
  keys=['AvailableStepsCount','Type','Max','Min','SingleValue','Shape']
  + keys=['Name'] returns only the variable names as 1st-level keys
  leave empty to return all possible keys
  Returns
  