Define authentication device before first use

[Dave Tonge]

From Torsten:

The term „consumption device“ is first used Section 1, 1st paragraph without description. Readers not familiar with the Mobile Connect/MODRNA terminology don’t know this term.

[Dave Tonge]

I made a typo in the issue :-) But we agreed that we need to probably define both the authentication and consumption devices.

[Dave Tonge]

PR here: https://bitbucket.org/openid/mobile/pull-requests/64/attempt-to-improve-the-intro-to-define-cd/diff

Not sure about the wording, so feedback appreciated

[Dave Tonge]

PR merged