ask util command usage help

[Shreyas-vgr]

Provide better documentation on usage of ask util generate-lwa-tokens.
I realized recently there is an behavior change on CLI v2 for this util command where all the parameters are optional and running the util command without any arguments produces the refresh_token w.r.t CLI clientId and clientSecret rather than asking for users credentials which resulted in few customer facings issues on ASK SDK Python repo.

I'm submitting a...

[ ] Regression (a behavior that used to work and stopped working in a new release)
[ ] Bug report  
[ ] Performance issue
[ ] Feature request
[x] Documentation issue or request 
[ ] Other... Please describe: 

Expected Behavior

• Ask the developer about credentials as input.

Steps to Reproduce (for bugs)

• ask util generate-lwa-tokens provides the refresh_token credentials by default.

Possible Solution

• Better usage description on the command or update on documentations

Your Environment and Context

• ask-cli version: 2.22.4
• Operating System and version: macOS
• Node.js version used for development: v12.20.1
• NPM version used for development: 7.6.2