Use official database name [ci skip]

* s/Postgres/PostgreSQL/
* s/MYSQL/MySQL/, s/Mysql/MySQL/
* s/Sqlite/SQLite/

Replaced all newly added them after 6089b31.

2 files changed, 2 insertions, 2 deletions

diff --git a/guides/source/active_record_basics.md b/guides/source/active_record_basics.md
index 7f17b19a13..d765e32ac7 100644
--- a/guides/source/active_record_basics.md
+++ b/guides/source/active_record_basics.md
@@ -105,7 +105,7 @@ depending on the purpose of these columns.
   fields that Active Record will look for when you create associations between
   your models.
 * **Primary keys** - By default, Active Record will use an integer column named
-  `id` as the table's primary key (`bigint` for Postgres and MYSQL, `integer`
+  `id` as the table's primary key (`bigint` for PostgreSQL and MySQL, `integer`
   for SQLite). When using [Active Record Migrations](active_record_migrations.html)
   to create your tables, this column will be automatically created.
 
diff --git a/guides/source/i18n.md b/guides/source/i18n.md
index dab73bfbc2..d6fccadb28 100644
--- a/guides/source/i18n.md
+++ b/guides/source/i18n.md
@@ -1206,7 +1206,7 @@ The I18n API described in this guide is primarily intended for translating inter
 Several gems can help with this:
 
 * [Globalize](https://github.com/globalize/globalize): Store translations on separate translation tables, one for each translated model
-* [Mobility](https://github.com/shioyama/mobility): Provides support for storing translations in many formats, including translation tables, json columns (Postgres), etc.
+* [Mobility](https://github.com/shioyama/mobility): Provides support for storing translations in many formats, including translation tables, json columns (PostgreSQL), etc.
 * [Traco](https://github.com/barsoom/traco): Translatable columns for Rails 3 and 4, stored in the model table itself
 
 Conclusion