Update UI docs: `<devtools-split-widget>` => `<devtools-split-view>`

Bug: none
Change-Id: I8a22320abd4b7174469b1a0b727f5ceb7eb45e04
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6547056
Reviewed-by: Danil Somsikov <[email protected]>
Commit-Queue: Danil Somsikov <[email protected]>
Auto-Submit: Wolfgang Beyer <[email protected]>
diff --git a/docs/ui_engineering.md b/docs/ui_engineering.md
index a4f9a48..aa92cd7 100644
--- a/docs/ui_engineering.md
+++ b/docs/ui_engineering.md
@@ -44,14 +44,14 @@
 
 ```html
 <devtools-widget .widgetConfig=${widgetConfig(ElementsPanel)}>
-  <devtools-split-widget>
+  <devtools-split-view>
     <devtools-widget slot="main" .widgetConfig=${widgetConfig(ElementsTree)}></devtools-widget>
     <devtools-tab-pane slot="sidebar">
       <devtools-widget .widgetConfig=${widgetConfig(StylesPane, {element: input.element})}></devtools-widget>
       <devtools-widget .widgetConfig=${widgetConfig(ComputedPane, {element: input.element})}></devtools-widget>
       ...
     </devtools-tab-pane>
-  </devtools-split-widget>
+  </devtools-split-view>
 </devtools-widget>
 ```