Add tier badges

Add Free tier badges to update docs.

doc/update/index.md

@@ -4,7 +4,7 @@ group: Distribution
 info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
 ---
 
-# Upgrading GitLab
+# Upgrading GitLab **(FREE SELF)**
 
 Upgrading GitLab is a relatively straightforward process, but the complexity
 can increase based on the installation method you have used, how old your

doc/update/patch_versions.md

@@ -5,7 +5,7 @@ info: To determine the technical writer assigned to the Stage/Group associated w
 comments: false
 ---
 
-# Universal update guide for patch versions of source installations
+# Universal update guide for patch versions of source installations **(FREE SELF)**
 
 ## Select Version to Install
 

doc/update/restore_after_failure.md

@@ -4,7 +4,7 @@ group: Distribution
 info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
 ---
 
-# Restoring from backup after a failed upgrade
+# Restoring from backup after a failed upgrade **(FREE SELF)**
 
 Upgrades are usually smooth and restoring from backup is a rare occurrence.
 However, it's important to know how to recover when problems do arise.

doc/update/upgrading_from_ce_to_ee.md

@@ -5,7 +5,7 @@ info: To determine the technical writer assigned to the Stage/Group associated w
 comments: false
 ---
 
-# Upgrading from Community Edition to Enterprise Edition from source
+# Upgrading from Community Edition to Enterprise Edition from source **(FREE SELF)**
 
 NOTE:
 In the past we used separate documents for upgrading from

doc/update/upgrading_from_source.md

@@ -5,7 +5,7 @@ info: To determine the technical writer assigned to the Stage/Group associated w
 comments: false
 ---
 
-# Upgrading Community Edition and Enterprise Edition from source
+# Upgrading Community Edition and Enterprise Edition from source **(FREE SELF)**
 
 NOTE:
 Users wishing to upgrade to 12.0.0 must take some extra steps. See the