Primer edits - Architecture section  (#390)
Primer edits - Architecture section  (#390)

* Architecture section

Signed-off-by: Clemens Vasters <8eba307d63c1bf868faedc1e77af034a4ee582f9@microsoft.com>

* addressing comments

Signed-off-by: Clemens Vasters <8eba307d63c1bf868faedc1e77af034a4ee582f9@microsoft.com>

* link fix

Signed-off-by: Clemens Vasters <8eba307d63c1bf868faedc1e77af034a4ee582f9@microsoft.com>

cloudevents/spec