[release-12.0.2] Docs: Fix missing link for OTEL in Grafana's about page (#106572)

Co-authored-by: mihaelmiklec <mihael.miklec1@gmail.com>
Co-authored-by: Irene Rodriguez <irene.rodriguez@grafana.com>
Fix missing link for OTEL in Grafana's about page (#106324)

docs/sources/introduction/_index.md

@@ -84,7 +84,7 @@ In addition to Grafana, Grafana Labs also provides the following open source pro
 
 **Grafana Beyla:** Grafana Beyla is an eBPF-based application auto-instrumentation tool for application observability. eBPF is used to automatically inspect application executables and the OS networking layer as well as capture basic trace spans related to web transactions and Rate-Errors-Duration (RED) metrics for Linux HTTP/S and gRPC services. All data capture occurs without any modifications to application code or configuration. For more information about Grafana Beyla, refer to [Grafana Beyla documentation](/docs/beyla/latest/).
 
-**Grafana Alloy:** Grafana Alloy is a flexible, high performance, vendor-neutral distribution of the [OpenTelemetry][] (OTel) Collector.
+**Grafana Alloy:** Grafana Alloy is a flexible, high performance, vendor-neutral distribution of the [OpenTelemetry](https://opentelemetry.io/) (OTel) Collector.
 It's fully compatible with the most popular open source observability standards such as OpenTelemetry (OTel) and Prometheus.
 For more information about Grafana Alloy, refer to the [Grafana Alloy documentation](https://grafana.com/docs/alloy/latest/).