[fix] Routes check on e2e tests (#3022)

This PR updates our end to end tests so that they check every route in
our examples to ensure that it loads (skipping any routes that don't
features a canvas).

### Change Type

- [x] `tests` — Changes to any test code only[^2]

### Test Plan

- [x] End to end tests

apps/docs/scripts/functions/createApiMarkdown.ts

@@ -83,5 +83,5 @@ export async function createApiMarkdown() {
 		1
 	)
 	sectionsJson.push(apiInputSection)
-	fs.writeFileSync(sectionsJsonPath, JSON.stringify(sectionsJson, null, '\t'))
+	fs.writeFileSync(sectionsJsonPath, JSON.stringify(sectionsJson, null, '\t') + '\n')
 }