fix(docs): Correct optional parameter syntax in caching code snippet (#411)

Updated the `getScheduledEvents` function definition in `epic-stack/docs/caching.md` to correctly denote the `timings` parameter as optional.

- Changed `timings: Timings` to `timings?: Timings` to make it valid TypeScript code.

This fix ensures developers referencing the caching documentation will not encounter issues related to this specific code snippet.

Author: MoSattler

docs/caching.md

@@ -44,7 +44,7 @@ const eventSchema = z.object({
 export async function getScheduledEvents({
 	timings,
 }: {
-	timings: Timings
+	timings?: Timings
 } = {}) {
 	const scheduledEvents = await cachified({
 		key: 'tito:scheduled-events',