docs: Fix typo in navigation.json (#36955)

While creating the new tutorial section, I hit o instead of i when
typing the word 'tooltip.' This is understandable, as they are right
next to each other on the keyboard. I might move to the Dvorak
keyboard layout to avoid such errors in the future.

PR Close #36955

aio/content/navigation.json

@@ -748,7 +748,7 @@
     },
     {
       "title": "Tutorials",
-      "tooltop": "End-to-end tutorials for learning Angular concepts and patterns.",
+      "tooltip": "End-to-end tutorials for learning Angular concepts and patterns.",
       "children": [
         {
           "url": "guide/router-tutorial",