use alternate spark link

Author: jaydeluca

docs/instrumentation-list.yaml

@@ -6135,7 +6135,7 @@ libraries:
   - name: spark-2.3
     description: |
       This instrumentation does not emit telemetry on its own. Instead, it extracts the HTTP route and attaches it to HTTP server spans and HTTP server metrics.
-    library_link: https://github.com/perwendel/spark
+    library_link: https://sparkjava.com/
     source_path: instrumentation/spark-2.3
     scope:
       name: io.opentelemetry.spark-2.3

instrumentation/spark-2.3/metadata.yaml

@@ -1,4 +1,4 @@
 description: > 
   This instrumentation does not emit telemetry on its own. Instead, it extracts the HTTP route and
   attaches it to HTTP server spans and HTTP server metrics.
-library_link: https://github.com/perwendel/spark
+library_link: https://sparkjava.com/