fix all {toc} to have blank line before

CONTRIBUTING.md

@@ -8,6 +8,7 @@ Before you begin contributing content to the SDK, please read this page thorough
 For information about contributing to the IntelliJ Platform itself, please visit [Contributing to the IntelliJ Platform](/basics/platform_contributions.md).
 
 Here are some useful things to know before authoring SDK content and submitting your Pull Request.
+
 * Dummy list item
 {:toc}
 

basics/disposers.md

@@ -15,6 +15,7 @@ A `Disposable` is an interface for any object providing a `Disposable.dispose()`
 
 The `Disposer` supports chaining `Disposables` in parent-child relationships.
 
+* bullet list
 {:toc}
 
 ## Automatically Disposed Objects

tutorials/editor_basics/coordinates_system.md

@@ -9,6 +9,7 @@ The examples replaced selected text in a document by using information about the
 Every caret has a set of properties describing its position in one of several coordinate systems.
 This tutorial describes how to access information about the caret(s) in an editor.
 The tutorial presents the following sections:
+
 * bullet list
 {:toc}
 

tutorials/editor_basics/editor_events.md

@@ -11,6 +11,7 @@ Two classes from the [editor_basics](https://github.com/JetBrains/intellij-sdk-c
 * Creating and registering a custom [`TypedActionHandler`](upsource:///platform/platform-api/src/com/intellij/openapi/editor/actionSystem/TypedActionHandler.java) to intercept keystrokes and change the document.
 
 The tutorial presents the following sections:
+
 * bullet list
 {:toc}
 

tutorials/editor_basics/working_with_text.md

@@ -6,6 +6,7 @@ title: Working with Text
 This tutorial shows how to use actions to access a caret placed in a document open in an editor.
 Using information about the caret, replace selected text in a document with a string.
 The tutorial presents the following sections:
+
 * bullet list
 {:toc}