add Options to docs

Author: armano2

docs/rules/computed-property-return.md

@@ -37,4 +37,11 @@ export default {
 
 ## :wrench: Options
 
-Nothing.
+This rule has an object option:
+- `"treatUndefinedAsUnspecified"`: `true` (default) allows implicitly returning undefined with a `return;` statement.
+
+```
+vue/order-in-components: [2, {
+  treatUndefinedAsUnspecified: true
+}]
+```