Generate docs with controller-gen v0.2.0-beta.5

This includes a fix that was causing us to miss some markers in the
docs.

Author: DirectXMan12

docs/book/install-and-build.sh

@@ -44,7 +44,7 @@ chmod +x /tmp/mdbook
 echo "grabbing the latest released controller-gen"
 # TODO(directxman12): remove the @v0.2.0-beta.4 once get v0.2.0 released,
 # so that we actually get the latest version
-go get sigs.k8s.io/controller-tools/cmd/controller-gen@v0.2.0-beta.4
+go get sigs.k8s.io/controller-tools/cmd/controller-gen@v0.2.0-beta.5
 
 # make sure we add the go bin directory to our path
 gobin=$(go env GOBIN)