fix typo in `terraform` docs (#6503)

fix typo

The [Docs](https://docs.ansible.com/ansible/latest/collections/community/general/terraform_module.html) have a typo in the examples. `camplex_vars` should be spelled `complex_vars`. 

Since many people are copy-and-pasting from docs and modify them to their needs this typo is an annoyance for users.

plugins/modules/terraform.py

@@ -218,7 +218,7 @@ EXAMPLES = """
   community.general.terraform:
     project_path: '{{ project_dir }}'
     state: present
-    camplex_vars: true
+    complex_vars: true
     variables:
       vm_name: "{{ inventory_hostname }}"
       vm_vcpus: 2