Add tier badges to reference architectures docs

doc/administration/reference_architectures/10k_users.md

@@ -5,7 +5,7 @@ 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/#designated-technical-writers
 ---
 
-# Reference architecture: up to 10,000 users
+# Reference architecture: up to 10,000 users **(PREMIUM ONLY)**
 
 This page describes GitLab reference architecture for up to 10,000 users. For a
 full list of reference architectures, see

doc/administration/reference_architectures/1k_users.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/#designated-technical-writers
 ---
 
-# Reference architecture: up to 1,000 users
+# Reference architecture: up to 1,000 users **(CORE ONLY)**
 
 This page describes GitLab reference architecture for up to 1,000 users. For a
 full list of reference architectures, see

doc/administration/reference_architectures/25k_users.md

@@ -5,7 +5,7 @@ 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/#designated-technical-writers
 ---
 
-# Reference architecture: up to 25,000 users
+# Reference architecture: up to 25,000 users **(PREMIUM ONLY)**
 
 This page describes GitLab reference architecture for up to 25,000 users. For a
 full list of reference architectures, see

doc/administration/reference_architectures/2k_users.md

@@ -5,7 +5,7 @@ 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/#designated-technical-writers
 ---
 
-# Reference architecture: up to 2,000 users
+# Reference architecture: up to 2,000 users **(CORE ONLY)**
 
 This page describes GitLab reference architecture for up to 2,000 users.
 For a full list of reference architectures, see

doc/administration/reference_architectures/3k_users.md

@@ -5,7 +5,7 @@ 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/#designated-technical-writers
 ---
 
-# Reference architecture: up to 3,000 users
+# Reference architecture: up to 3,000 users **(PREMIUM ONLY)**
 
 This page describes GitLab reference architecture for up to 3,000 users. For a
 full list of reference architectures, see

doc/administration/reference_architectures/50k_users.md

@@ -5,7 +5,7 @@ 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/#designated-technical-writers
 ---
 
-# Reference architecture: up to 50,000 users
+# Reference architecture: up to 50,000 users **(PREMIUM ONLY)**
 
 This page describes GitLab reference architecture for up to 50,000 users. For a
 full list of reference architectures, see

doc/administration/reference_architectures/5k_users.md

@@ -5,7 +5,7 @@ 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/#designated-technical-writers
 ---
 
-# Reference architecture: up to 5,000 users
+# Reference architecture: up to 5,000 users **(PREMIUM ONLY)**
 
 This page describes GitLab reference architecture for up to 5,000 users. For a
 full list of reference architectures, see