Simpler language, consistent Yii 2.0 usage

Author: samdark

src/guide/databases/db-migrations.md

@@ -91,9 +91,9 @@ final class M240115143455CreateMyFirstTableTable implements RevertibleMigrationI
 
 For more information [see](https://github.com/yiisoft/db-migration/tree/master/docs/guide/en)
 
-### Upgrading from Yii2
+### Upgrading from Yii 2.0
 
-Migrations in Yii2 and the [yiisoft/db-migration](https://github.com/yiisoft/db-migration/) package are not compatible,
+Migrations in Yii 2.0 and the [yiisoft/db-migration](https://github.com/yiisoft/db-migration/) package are not compatible,
 and the `migration` table is also not
 compatible.
 A probable solution is to use structure dumps and rename the old `migration` table. Upon the initial execution of

src/guide/intro/upgrade-from-v2.md

@@ -1,15 +1,15 @@
 # Upgrading from Version 2.0
 
-> If you haven't used Yii2, you can skip this section and get directly to "[getting started](../start/prerequisites.md)"
+> If you haven't used Yii 2.0, you can skip this section and get directly to "[getting started](../start/prerequisites.md)"
 > section.
 
-While sharing some common ideas and values, Yii3 is conceptually different from Yii 2. There is no easy upgrade
-path, so first [check maintenance policy and end-of-life dates for Yii 2](https://www.yiiframework.com/release-cycle)
-and consider starting new projects on Yii3 while keeping existing ones on Yii 2.
+While sharing some common ideas and values, Yii3 is conceptually different from Yii 2.0. There is no easy upgrade
+path, so first [check maintenance policy and end-of-life dates for Yii 2.0](https://www.yiiframework.com/release-cycle)
+and consider starting new projects on Yii3 while keeping existing ones on Yii 2.0.
 
 ## PHP requirements
 
-Yii3 requires PHP 8.2 or above. As a result, there are language features used that weren't used in Yii 2:
+Yii3 requires PHP 8.2 or above. As a result, there are language features used that weren't used in Yii 2.0:
 
 - [Type declarations](https://www.php.net/manual/en/functions.arguments.php#functions.arguments.type-declaration)
 - [Return type declarations](https://www.php.net/manual/en/functions.returning-values.php#functions.returning-values.type-declaration)
@@ -26,7 +26,7 @@ Yii3 requires PHP 8.2 or above. As a result, there are language features used th
 
 ## Preliminary refactoring
 
-It's a good idea to refactor your Yii 2 project before porting it to Yii3. That would both make porting easier
+It's a good idea to refactor your Yii 2.0 project before porting it to Yii3. That would both make porting easier
 and benefit the project in question while it's not moved to Yii3 yet.
 
 ### Use DI instead of the service locator
@@ -67,7 +67,7 @@ that's all the business logic has to go to framework-independent classes.
 
 ### Move more into components
 
-Yii3 services are conceptually similar to Yii 2 components, so it's a good idea to move reusable parts of your application
+Yii3 services are conceptually similar to Yii 2.0 components, so it's a good idea to move reusable parts of your application
 into components.
 
 ## Things to learn
@@ -85,16 +85,16 @@ It's a good idea to learn how to use it and use it for your own projects since i
 
 Yii3 application templates are using [environment variables](https://en.wikipedia.org/wiki/Environment_variable)
 to configure parts of the application. The concept is [very handy for Dockerized applications](https://12factor.net/)
-but might be alien to users of Yii 1.1 and Yii 2.
+but might be alien to users of Yii 1.1 and Yii 2.0.
 
 ### Handlers
 
-Unlike Yii2, Yii3 doesn't have controllers per se. Instead, it uses [handlers](../structure/handler.md) which
+Unlike Yii 2.0, Yii3 doesn't have controllers concept. Instead, it uses [handlers](../structure/handler.md) which
 are similar to controllers but different.
 
 ### Application structure
 
-Suggested Yii3 application structure is different from Yii 2. 
+Suggested Yii3 application structure is different from Yii 2.0. 
 It's described in [application structure](../structure/overview.md).
 
-Despite that, Yii3 is flexible, so it's still possible to use a structure similar to Yii 2 with Yii3.
+Despite that, Yii3 is flexible, so it's still possible to use a structure similar to Yii 2.0 with Yii3.