Fix for few sections to match doc style guidelines

Yii2 -> Yii 2

docs/guide/glossary.md

@@ -52,7 +52,7 @@ Module is a sub-application which contains MVC elements by itself, such as model
 
 ## namespace
 
-Namespace refers to a [PHP language feature](http://php.net/manual/en/language.namespaces.php) which is actively used in Yii2.
+Namespace refers to a [PHP language feature](http://php.net/manual/en/language.namespaces.php) which is actively used in Yii 2.
 
 # P
 

docs/guide/test-environment-setup.md

@@ -3,7 +3,7 @@ Testing environment setup
 
 > Note: This section is under development.
 
-Yii2 has officially maintained integration with [`Codeception`](https://github.com/Codeception/Codeception) testing
+Yii 2 has officially maintained integration with [`Codeception`](https://github.com/Codeception/Codeception) testing
 framework that allows you to create the following test types:
 
 - [Unit testing](test-unit.md) - verifies that a single unit of code is working as expected;

docs/guide/test-unit.md

@@ -22,4 +22,4 @@ Framework unit tests
 --------------------
 
 If you want to run unit tests for Yii framework itself follow
-"[Getting started with Yii2 development](https://github.com/yiisoft/yii2/blob/master/docs/internals/getting-started.md)".
+"[Getting started with Yii 2 development](https://github.com/yiisoft/yii2/blob/master/docs/internals/getting-started.md)".

docs/guide/tutorial-yii-integration.md

@@ -160,7 +160,7 @@ class Yii extends \yii\BaseYii
 }
 
 Yii::$classMap = include($yii2path . '/classes.php');
-// register Yii2 autoloader via Yii1
+// register Yii 2 autoloader via Yii 1
 Yii::registerAutoloader(['Yii', 'autoload']);
 // create the dependency injection container
 Yii::$container = new yii\di\Container;