Random Tuner does not accept argument classArgs

[seanytak]

Short summary about the issue/question:

Brief what process you are following:
When specifying a config.yml

# config.yml
tuner:
  builtinTunerName: Random
  classArgs:
    optimize_mode: maximize

an error of

ERROR: Your config file is not correct, please check your config file content!
ERROR: Wrong key 'classArgs' in {'builtinTunerName': 'Random', 'classArgs': {'optimize_mode': 'maximize'}}

is returned from the command

nnictl create --config config.yml

Removing classArgs does appear to fix the issue but the docs say this should be an acceptable key

How to reproduce it:

nni Environment:

• nni version: 1.5
• nni mode(local|pai|remote): local
• OS: Ubuntu 18.04
• python version: 3.6.10
• is conda or virtualenv used?: conda
• is running in docker?: no

need to update document(yes/no):
If this is a documentation error on Random Tuner Docs yes, otherwise no

Anything else we need to know:
Per #903 this seems like a documentation error

[chicm-ms]

@seanytak Thanks for reporting this issue, it is indeed a document error.