fixup doc generation

docs/generated/.files_generated

@@ -0,0 +1 @@
+oc_by_example_content.adoc

docs/generated/oc_by_example_content.adoc

@@ -0,0 +1,3 @@
+This file is autogenerated, but we've stopped checking such files into the
+repository to reduce the need for rebases. Please run hack/generate-docs.sh to
+populate this file.

tools/gendocs/gen_openshift_docs.go

@@ -51,5 +51,8 @@ func main() {
 	cmd := cli.NewCommandCLI("oc", "oc", &bytes.Buffer{}, out, ioutil.Discard)
 	kcmdutil.AddPrinterFlags(cmd)
 
-	gendocs.GenDocs(cmd, outFile)
+	if err := gendocs.GenDocs(cmd, outFile); err != nil {
+		fmt.Fprintf(os.Stderr, "failed to generate docs: %v\n", err)
+		os.Exit(1)
+	}
 }