Enterprise docs: Replace links with p-links

The presubmit told me so.

TBR=rsorokin@chromium.org
BUG=b/138287069
TEST=None

Change-Id: I6e32ff7e4cc74e044e949e09a75d8fffbd271c5c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1731835
Reviewed-by: Lutz Justen <ljusten@chromium.org>
Commit-Queue: Lutz Justen <ljusten@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683505}

docs/enterprise/active_directory_native_integration.md

@@ -7,9 +7,9 @@ credentials. Admins manage sessions and push policies to users and devices from
 their AD servers using group policy. There is no need to synchronize users to
 Google.
 
-[Google Chrome Enterprise Help article](https://support.google.com/chrome/a/answer/7497916)
+[Google Chrome Enterprise Help article](https://support.google.com/chrome/a?p=ad)
 
-[Troubleshoot Active Directory](https://support.google.com/chrome/a/answer/7497305)
+[Troubleshoot Active Directory](https://support.google.com/chrome/a?p=troubleshoot_ad)
 
 [TOC]
 
@@ -73,7 +73,7 @@ the content area.
 
 Moreover, users may sign up for a Play Store account from within their user
 session, see step 5 of the
-[Help article](https://support.google.com/chrome/a/answer/7497916).
+[Help article](https://support.google.com/chrome/a?p=ad).
 For this purpose, DM Server creates a LaForge account for the user. A LaForge
 account is a shadow Gaia account with scope limited to the Play Store. To prove
 the user's identity, a SAML flow is employed with DM Server as service provider

docs/enterprise/policies.md

@@ -35,7 +35,7 @@ On these systems it is also possible to set machine-wide cloud-based policies.
 ** Chrome OS **
 
 Chrome OS devices can be either cloud-managed or Active Directory managed
-([AdManagement](https://support.google.com/chrome/a/answer/7497916?hl=en)).
+([AdManagement](https://support.google.com/chrome/a?p=ad)).
 
 The cloud source is usually called DMServer (device management server).
 Organization admins can configure both device and cloud policies using

docs/enterprise/saml_authentication.md

@@ -14,7 +14,7 @@ Some enterprises use a more sophisticated model where authentication is handled
 by a third-party IdP (identity provider). GAIA supports this model via the
 industry-standard
 [SAML protocol](https://en.wikipedia.org/wiki/Security_Assertion_Markup_Language).
-A domain can be [configured](https://support.google.com/a/answer/6349809) to
+A domain can be [configured](https://support.google.com/a?p=sso) to
 use SAML authentication.
 
 ## Obtaining the user’s password