fix: greptimedb document link

Author: killme2008

data/ecosystem/vendors.yaml

@@ -410,7 +410,7 @@
   commercial: true
 - name: GreptimeDB
   nativeOTLP: true
-  url: https://docs.greptime.com/user-guide/ingest-data/for-observerbility/opentelemetry
+  url: https://docs.greptime.com/user-guide/ingest-data/for-observability/opentelemetry/
   contact: [email protected]
   oss: true
   commercial: true