WS-770 redux: just removing bad symlink and add capability versions restrictions doc

docs/source/architecture/capability_versions.md

+# Capability Versions
+
+## What is a capability version?
+
+A capability request, once created, can have one or more additional versions of the request
+created via its request status page. As soon as a new version is created, the original
+request is designated version 1; subsequent versions, if any, are then numbered sequentially.
+
+## Restrictions on capability versions
+
+Given that a capability request may contain two or more versions, rules governing
+the disposition of capability request versions become necessary. These rules are
+implemented as follows.
+
+* **One of the versions has passed QA**
+  * capability request state of passed version is set to *Complete*
+  * every other version's state is set to *Failed*
+  * no new versions may be created on this request
+
+
+* **One of the versions has failed QA**
+  * the version that has been failed has its state set to *Failed*
+
+
+* **All the versions have failed QA**
+  * each version has its state set to *Failed*
+  * the capability request is set to *Failed*

docs/source/architecture/delivery.md

-../../../apps/cli/executables/pexable/delivery/ARCHITECTURE.md
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