docs: document data-qa selector (#4986)

* docs: document data-qa selector

* chore: fix lint

Author: lmiller1990

docs/guides/references/cypress-studio.mdx

@@ -247,6 +247,9 @@ describe('Cypress Studio Demo', () => {
 })
 ```
 
+The selectors are generated according to the
+[`Cypress.SelectorPlayground` selector priority](/api/cypress-api/selector-playground-api#Default-Selector-Priority).
+
 ### Adding a New Test
 
 You can add a new test to any existing `describe` or `context` block, by

docs/partials/_default-selector-priority.mdx

@@ -1,10 +1,11 @@
-**_Default Selector Priority:_**
+### Default Selector Priority
 
 1. `data-cy`
 2. `data-test`
 3. `data-testid`
-4. `id`
-5. `class`
-6. `tag`
-7. `attributes`
-8. `nth-child`
+4. `data-qa`
+5. `id`
+6. `class`
+7. `tag`
+8. `attributes`
+9. `nth-child`