Minor spacing in yml comments + uncommented/lowered cap for dns section

As suggested by @drnic into https://github.com/cloudfoundry/cf-docs/pull/286#issuecomment-33378292
Add reference to Cf job specs that document the semantics of properties and mention of automatic generation of such manifest
Fixing default UAA admin authorities

As to avoid access_denied when trying to create a new user.
See related thread at https://groups.google.com/a/cloudfoundry.org/d/msg/vcap-dev/q9HlwPAPBTw/Aa3slgliuu8J
Adding pointers to UAA docs while managing uers

both UAA admin guide and UAA architecture into in cf-docs
Merge pull request #291 from Orange-OpenSource/cf-manifest-dns2

Minor spacing in yml comments + uncommented/lowered cap for dns section
Merge pull request #292 from Orange-OpenSource/cf-manifest-specs

Add reference to Cf job specs that document the semantics of properties and mention of automatic generation of such manifest
Merge pull request #293 from Orange-OpenSource/uaa-fix-admin-perm

Fixing default UAA admin authorities