fix(task): minor names and typos fixes

tasks/hostname_validation.yaml

@@ -2,11 +2,11 @@
 
 - name: Set default hostname
   ansible.builtin.set_fact:
-    guest_hostname: "new-lxc-test"
+    guest_hostname: "test-guest"
 
 - name: Prompt for hostname with immediate validation
   ansible.builtin.pause:
-    prompt: "Enter hostname (letters, digits, hyphens, dots; max 253 chars) [new-lxc-test]"
+    prompt: "Enter hostname (letters, digits, hyphens (but not leading and trailing), dots; max 253 chars) [{{ guest_hostname }}]"
   register: hostname_result
   until: >
     hostname_result.user_input | length == 0 or