Update policy text for enabling NTLMv2.

- Remove the text that indicated that the default was false.
- The default was changed but the text was not updated.

BUG=chromium:775518

Change-Id: I869b471a9b3772543c5e67824d41c9fcaa17eb8c
Reviewed-on: https://chromium-review.googlesource.com/917655
Commit-Queue: Zentaro Kavanagh <zentaro@chromium.org>
Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#536925}

components/policy/resources/policy_templates.json

@@ -2649,7 +2649,7 @@
 
           All recent versions of Samba and Windows servers support NTLMv2. This should only be disabled for backwards compatibility and reduces the security of authentication.
 
-          The default value when this policy is not defined is currently false for backwards compatibility, but will change to true in the future.''',
+          If this policy is not set, the default is true and NTLMv2 is enabled.''',
     },
     {
       'name': 'ExtensionInstallBlacklist',