Fix lint error

Author: xinyuezhang0402

lib/src/widgets/editor.dart

@@ -428,7 +428,8 @@ class QuillEditor extends StatefulWidget {
   /// Configures the dialog theme.
   final QuillDialogTheme? dialogTheme;
 
-  /// Configuration of handler for media content inserted via the system input method.
+  /// Configuration of handler for media content inserted via the system input
+  /// method.
   ///
   /// See [https://api.flutter.dev/flutter/widgets/EditableText/contentInsertionConfiguration.html]
   final ContentInsertionConfiguration? contentInsertionConfiguration;

lib/src/widgets/raw_editor.dart

@@ -271,7 +271,8 @@ class RawEditor extends StatefulWidget {
   /// Configures the dialog theme.
   final QuillDialogTheme? dialogTheme;
 
-  /// Configuration of handler for media content inserted via the system input method.
+  /// Configuration of handler for media content inserted via the system input
+  /// method.
   ///
   /// See [https://api.flutter.dev/flutter/widgets/EditableText/contentInsertionConfiguration.html]
   final ContentInsertionConfiguration? contentInsertionConfiguration;