Feature Request

• Yes, I reviewed the contribution guidelines.

Describe your use case and the problem you are facing

Currently, the wp cap add command documentation states the following about grant:

[--grant]
    Adds the capability as an explicit boolean value, instead of implicitly defaulting to true.
    ---
    default: true
    options:
    – true
    – false
    ---

This documentation is confusing and seems that wp cap add {role} {cap} --grant=false would add a capability as false, when it should actually be wp cap add {role} {cap} --no-grant.

Describe the solution you'd like

Update the documentation to state that --no-grant is the correct way to set an added capability to false.

[--no-grant]
    Adds the capability as an explicit boolean false value, instead of implicitly defaulting to true.