docs: added shape cycling shortcut in helper dialog (#9465)

* docs: added shape cycling shortcut in helper dialog

- Document Tab and Shift+Tab usage for shape cycling

* docs: added shape cycling shortcut in helper dialog

* Update packages/excalidraw/components/HelpDialog.tsx

* Update packages/excalidraw/locales/en.json

---------

Co-authored-by: David Luzar <5153846+dwelle@users.noreply.github.com>

packages/excalidraw/components/HelpDialog.tsx

@@ -247,6 +247,11 @@ export const HelpDialog = ({ onClose }: { onClose?: () => void }) => {
               label={t("toolBar.link")}
               shortcuts={[getShortcutKey("CtrlOrCmd+K")]}
             />
+            <Shortcut
+              label={t("toolBar.convertElementType")}
+              shortcuts={["Tab", "Shift+Tab"]}
+              isOr={true}
+            />
           </ShortcutIsland>
           <ShortcutIsland
             className="HelpDialog__island--view"

packages/excalidraw/locales/en.json

@@ -298,7 +298,8 @@
     "laser": "Laser pointer",
     "hand": "Hand (panning tool)",
     "extraTools": "More tools",
-    "mermaidToExcalidraw": "Mermaid to Excalidraw"
+    "mermaidToExcalidraw": "Mermaid to Excalidraw",
+    "convertElementType": "Toggle shape type"
   },
   "element": {
     "rectangle": "Rectangle",