[collection] Remove instance defaults from docs (#12964)

We don't specify defaults in the module (because it messes up Instance
updates because AWX things we are trying to change things to be the
default).

- Update the docs to remove the defaults that no longer exist
- Update tests to make them pass (oops)
- Fix tangentially related typo in Kind development docs

Signed-off-by: Rick Elrod <rick@elrod.me>

awx_collection/tests/integration/targets/instance/tasks/main.yml

@@ -14,6 +14,8 @@
     - name: Create an instance
       awx.awx.instance:
         hostname: "{{ item }}"
+        node_type: execution
+        node_state: installed
       with_items:
         - "{{ hostname1 }}"
         - "{{ hostname2 }}"
@@ -26,6 +28,8 @@
     - name: Create an instance with non-default config
       awx.awx.instance:
         hostname: "{{ hostname3 }}"
+        node_type: execution
+        node_state: installed
         capacity_adjustment: 0.4
         listener_port: 31337
       register: result