Fix library link

Author: KarstenSchnitter

cf-java-logging-support-core/beats/app-logs/docs/fields.asciidoc

@@ -17,7 +17,7 @@ This is a specification of the "app-logs beat" message type that we use to store
 "application logs" written via a proper logging infrastructure implementation.
 
 NOTE: For Java applications running on CF, this is our logging support library, see
-https://github.com/SAP/perfx/cf-java-logging-support
+https://github.com/SAP/cf-java-logging-support
 
 Field names follow the convention that we're not using camel case names, but
 rather use "_" as a delimiter between parts.

cf-java-logging-support-core/beats/app-logs/etc/fields.yml

@@ -16,7 +16,7 @@ summary: |
   "application logs" written via a proper logging infrastructure implementation.
 
   NOTE: For Java applications running on CF, this is our logging support library, see
-  https://github.com/SAP/perfx/cf-java-logging-support
+  https://github.com/SAP/cf-java-logging-support
 
   Field names follow the convention that we're not using camel case names, but
   rather use "_" as a delimiter between parts.