Improve wording of auth strategy mode/default

[ghost]

I found this wording confusing, and noticed other people have as well (e.g. dwyl/hapi-auth-jwt2#137 ). I think the proposed update better reflects when server.auth.strategy sets a default strategy for routes.

[Marsup]

Not sure it helps since the default is already false.

[ghost]

The original wording makes it sound like the strategy will only become the default auth for routes if required or true is specified as the mode. The reality is that when anything other than false is specified for the mode, the strategy will be set as the default strategy for routes.

[geek]

https://github.com/hapijs/hapi/blob/master/lib/auth.js#L69-L71

We definitely can clarify the wording... can you add in that if you do set it to true the auth mode will be set to required

[ghost]

I misunderstood you initially @Marsup . Pushed another commit to clarify further based on your guys' suggestions.

[lock]

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