fix some typos (#14017)

Co-authored-by: William Bouchard <46496014+willbouch@users.noreply.github.com>

www/apps/resources/sidebars/troubleshooting.mjs

@@ -95,7 +95,7 @@ export const troubleshootingSidebar = [
           {
             type: "link",
             path: "/troubleshooting/query/filter-linked",
-            title: "Not Exising Property",
+            title: "Not Existing Property",
           },
           {
             type: "link",