Docs module fails to build

[jamesnetherton]

Seems there's been a few changes to the Camel docs which have impacted CQ.

There's a long discussion about it here #3299.

There's a proposed solution here #3304 along with the recommendation that it's not actually applied.

So that leaves us in a state that given we seem to have no permanent or maintainable fix, I'm going to disable the xref checks in the docs module so that we can build the project successfully.