修正Sphinx单词拼写错误

docs/guide-zh-CN/db-active-record.md

@@ -37,7 +37,7 @@ $db->createCommand('INSERT INTO customer (name) VALUES (:name)', [
 * Microsoft SQL Server 2010 及以上：通过 [[yii\db\ActiveRecord]]
 * Oracle: 通过 [[yii\db\ActiveRecord]]
 * CUBRID 9.1 及以上：通过 [[yii\db\ActiveRecord]]
-* Sphnix：通过 [[yii\sphinx\ActiveRecord]]，需求 `yii2-sphinx` 扩展
+* Sphinx：通过 [[yii\sphinx\ActiveRecord]]，需求 `yii2-sphinx` 扩展
 * ElasticSearch：通过 [[yii\elasticsearch\ActiveRecord]]，需求 `yii2-elasticsearch` 扩展
 * Redis 2.6.12 及以上：通过 [[yii\redis\ActiveRecord]]，需求 `yii2-redis` 扩展
 * MongoDB 1.3.0 及以上：通过 [[yii\mongodb\ActiveRecord]]，需求 `yii2-mongodb` 扩展
@@ -1004,4 +1004,4 @@ TODO
 -------------------
 
 - [模型（Model）](model.md)
-- [[yii\db\ActiveRecord]]
\ No newline at end of file
+- [[yii\db\ActiveRecord]]