Tell the user what to prepare

Rather than telling the user to read ahead to figure out what
information to prepare, tell them the variables we're going to make use
of, and link them back to where we described them.  This should help in
the case a user is skipping ahead.

doc/administration/high_availability/alpha_database.md

@@ -173,9 +173,9 @@ Each node needs to be configured to run only the services it needs.
 
 On each Consul node perform the following:
 
-1. Make sure you collect all required information before executing the next step.
-See `START user configuration` section in the next step for required information.
-1. Edit `/etc/gitlab/gitlab.rb`:
+1. Make sure you collect [`CONSUL_SERVER_NODES`](#consul_information) before executing the next step.
+
+1. Edit `/etc/gitlab/gitlab.rb` replacing values noted in the `# START user configuration` section:
 
     ```ruby
     # Disable all components except Consul
@@ -213,9 +213,9 @@ After this is completed on each Consul server node, proceed further.
 
 On each database node perform the following:
 
-1. Make sure you collect all required information before executing the next step.
-See `START user configuration` section in the next step for required information.
-1. Edit `/etc/gitlab/gitlab.rb`:
+1. Make sure you collect [`CONSUL_SERVER_NODES`](#consul_information), [`PGBOUNCER_PASSWORD_HASH`](#pgbouncer_information), [`POSTGRESQL_PASSWORD_HASH`](#postgresql_information), [`Number of db nodes`](#postgresql_information), and [`Network Address`](#network_address) before executing the next step.
+
+1. Edit `/etc/gitlab/gitlab.rb` replacing values noted in the `# START user configuration` section:
 
     ```ruby
     # Disable all components except PostgreSQL and Repmgr and Consul
@@ -250,6 +250,7 @@ See `START user configuration` section in the next step for required information
     #
     # Replace PGBOUNCER_PASSWORD_HASH with a generated md5 value
     postgresql['pgbouncer_user_password'] = 'PGBOUNCER_PASSWORD_HASH'
+    # Replace POSTGRESQL_PASSWORD_HASH with a generated md5 value
     postgresql['sql_user_password'] = 'POSTGRESQL_PASSWORD_HASH'
     # Replace X with value of number of db nodes + 1
     postgresql['max_wal_senders'] = X
@@ -281,7 +282,9 @@ your configuration
 
 ### Configuring the Pgbouncer node
 
-1. Edit `/etc/gitlab/gitlab.rb`:
+1. Make sure you collect [`CONSUL_SERVER_NODES`](#consul_information), [`CONSUL_PASSWORD_HASH`](#consul_information), and [`PGBOUNCER_PASSWORD_HASH`](#pgbouncer_information) before executing the next step.
+
+1. Edit `/etc/gitlab/gitlab.rb` replacing values noted in the `# START user configuration` section:
 
     ```ruby
     # Disable all components except Pgbouncer and Consul agent