Remove db-pool configuration from documentation

Including the example config files.

config/database.yml.postgresql

@@ -5,7 +5,6 @@ production:
   adapter: postgresql
   encoding: unicode
   database: gitlabhq_production
-  pool: 10
   username: git
   password: "secure password"
   host: localhost
@@ -26,7 +25,6 @@ development:
   adapter: postgresql
   encoding: unicode
   database: gitlabhq_development
-  pool: 5
   username: postgres
   password: "secure password"
   host: localhost
@@ -38,7 +36,6 @@ staging:
   adapter: postgresql
   encoding: unicode
   database: gitlabhq_staging
-  pool: 10
   username: git
   password: "secure password"
   host: localhost
@@ -50,7 +47,6 @@ test: &test
   adapter: postgresql
   encoding: unicode
   database: gitlabhq_test
-  pool: 5
   username: postgres
   password:
   host: localhost

config/database_geo.yml.postgresql

@@ -5,7 +5,6 @@ production:
   adapter: postgresql
   encoding: unicode
   database: gitlabhq_geo_production
-  pool: 10
   username: git
   password: "secure password"
   host: localhost
@@ -18,7 +17,6 @@ development:
   adapter: postgresql
   encoding: unicode
   database: gitlabhq_geo_development
-  pool: 5
   username: postgres
   password: "secure password"
   host: localhost
@@ -31,7 +29,6 @@ staging:
   adapter: postgresql
   encoding: unicode
   database: gitlabhq_geo_staging
-  pool: 10
   username: git
   password: "secure password"
   host: localhost
@@ -44,7 +41,6 @@ test: &test
   adapter: postgresql
   encoding: unicode
   database: gitlabhq_geo_test
-  pool: 5
   username: postgres
   password:
   host: localhost

doc/install/installation.md

@@ -567,7 +567,6 @@ sudo -u git cp config/database.yml.postgresql config/database.yml
 #     adapter: postgresql
 #     encoding: unicode
 #     database: gitlabhq_production
-#     pool: 10
 #
 sudo -u git -H editor config/database.yml