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commenter.md: cleanup

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tutorials/custom_language_support/commenter.md
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@ -4,21 +4,20 @@ title: 17. Commenter
<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
A commenter enables the user to comment-out a line of code at the cursor or selected code automatically.
The [`Commenter`](upsource:///platform/core-api/src/com/intellij/lang/Commenter.java) defines support for "Comment with Line Comment" and "Comment with Block Comment" actions.
The [`Commenter`](upsource:///platform/core-api/src/com/intellij/lang/Commenter.java) defines support for **Code \| Comment with Line Comment** and **Code \| Comment with Block Comment** actions.
* bullet list
{:toc}
## 17.1. Define a Commenter
The Simple Language commenter subclasses `Commenter`.
This commenter defines the line comment prefix as "#".
The commenter for Simple Language defines the line comment prefix as `#`.
```java
{% include /code_samples/simple_language_plugin/src/main/java/org/intellij/sdk/language/SimpleCommenter.java %}
```
## 17.2. Register the Commenter
The `SimpleCommenter` implementation is registered with the IntelliJ Platform in the plugin configuration file using the `com.intellij.lang.commenter` extension point.
The `SimpleCommenter` implementation is registered in the plugin configuration file using the `com.intellij.lang.commenter` extension point.
```xml
<extensions defaultExtensionNs="com.intellij">