automaticSilentRenew defaults to true, not false

AuthProviderProps indicates that `automaticSilentRenew defaults to false:

Lines 83 to 88 in f072377

    
             /** 
        
              * Flag to indicate if there should be an automatic attempt to renew the access token prior to its expiration. 
        
              * 
        
              * defaults to false 
        
              */ 
        
             automaticSilentRenew?: boolean;

But in the event that it is undefined in the user supplied config (which is likely the case), then it actually defaults to true via UserManagerSettings.ts#L51-L52

In any case, defaulting to true is probably the correct behavior, so the interface docs just need to be updated.

	/**
	* Flag to indicate if there should be an automatic attempt to renew the access token prior to its expiration.
	*
	* defaults to false
	*/
	automaticSilentRenew?: boolean;