Fixed typo in metrics disclaimer (#10319)

Author: ale-cota

includes/metrics-api-change.mdx

@@ -1,3 +1,3 @@
 <Alert level="warning" title="Upcoming API Changes">
-We'lll be updating our API to ensure that metrics are explicitly connected to spans. This change will improve debugging capabilities by ensuring that metrics are always contextually linked with all your Sentry data through traces. You'll eventually need to migrate to the new APIs once released. [Learn more](https://sentry.zendesk.com/hc/en-us/articles/26369339769883-Upcoming-API-Changes-to-Metrics).
+We'll be updating our API to ensure that metrics are explicitly connected to spans. This change will improve debugging capabilities by ensuring that metrics are always contextually linked with all your Sentry data through traces. You'll eventually need to migrate to the new APIs once released. [Learn more](https://sentry.zendesk.com/hc/en-us/articles/26369339769883-Upcoming-API-Changes-to-Metrics).
 </Alert>