xml: Fix validate-modules issue (#40121)

lib/ansible/modules/files/xml.py

@@ -40,7 +40,6 @@ options:
     description:
     - A valid XPath expression describing the item(s) you want to manipulate.
     - Operates on the document root, C(/), by default.
-    default: /
   namespaces:
     description:
     - The namespace C(prefix:uri) mapping for the XPath expression.

test/sanity/validate-modules/ignore.txt

@@ -686,7 +686,6 @@ lib/ansible/modules/files/synchronize.py E325
 lib/ansible/modules/files/synchronize.py E327
 lib/ansible/modules/files/unarchive.py E322
 lib/ansible/modules/files/unarchive.py E323
-lib/ansible/modules/files/xml.py E324
 lib/ansible/modules/identity/cyberark/cyberark_user.py E324
 lib/ansible/modules/identity/ipa/ipa_dnsrecord.py E325
 lib/ansible/modules/identity/ipa/ipa_dnszone.py E325