Update help icon text

src/frontend/help_icons.tsx

@@ -31,7 +31,7 @@ export const graphEditorReadonly = makeInfoHoverCardIcon(<>
 
 export const rountangleEditor = makeInfoHoverCardIcon(<>
   <Text><b>Alt + Left-Click</b>: Create/Delete Rountangle</Text>
-  <Text><b>Left-Drag</b>: Move Rountangle</Text>
+  <Text><b>Left-Drag</b>: Move Rountangle / Pan Canvas</Text>
 </>);
 
 export const depGraph = makeInfoHoverCardIcon(<>