Documentation: Snippets support

Change-Id: I40dd20a7da93ab7af3044d9bebf49e15dbfb7aa4
Reviewed-on: http://codereview.qt.nokia.com/184
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@nokia.com>

src/plugins/texteditor/snippets/snippeteditor.cpp

@@ -41,6 +41,13 @@
 
 using namespace TextEditor;
 
+/*!
+    \class TextEditor::SnippetEditorWidget
+    \brief The SnippetEditorWidget class is a lightweight editor for code snippets
+    with basic support for syntax highlighting, indentation, and others.
+    \ingroup Snippets
+*/
+
 SnippetEditor::SnippetEditor(SnippetEditorWidget *editor)
     : BaseTextEditor(editor)
 {