VMware: Add documentation for customValue (#41399)

* VMware: Add documentation for customValue

In order to populate custom values (custom attributes of virtual machine)
inside hostvars, customValue needs to be uncommented under the section
properties in vmware_inventory.ini

* Remove unwanted single quotes from custom_field_group_prefix

Fixes: #41395

Signed-off-by: Abhijeet Kasurde <akasurde@redhat.com>

contrib/inventory/vmware_inventory.ini

@@ -91,7 +91,7 @@ password=vmware
 
 # You can customize prefix used by custom field hostgroups generation here.
 # vmware_tag_ prefix is the default and consistent with ec2_tag_
-#custom_field_group_prefix = 'vmware_tag_'
+#custom_field_group_prefix = vmware_tag_
 
 # The script attempts to recurse into virtualmachine objects and serialize
 # all available data. The serialization is comprehensive but slow. If the
@@ -115,3 +115,6 @@ password=vmware
 #prop10=guest.guestId
 #prop11=guest.guestState
 #prop12=runtime.maxMemoryUsage
+# In order to populate `customValue` (virtual machine's custom attributes) inside hostvars,
+# uncomment following property. Please see - https://github.com/ansible/ansible/issues/41395
+#prop13=customValue