Update changelog.txt

Fix wrong links

Author: laeubi

scr/changelog.txt

@@ -4,7 +4,7 @@ Changes in 2.2.15
     * Document Satisfying Condition feature as OSGi R8 specification-compliant
       - The existing satisfying condition implementation is now documented as compliant 
         with the preliminary OSGi R8 Declarative Services specification changes
-      - See https://github.com/osgi/osgi/pull/875 and https://github.com/osgi/osgi/issues/720
+      - See https://docs.osgi.org/specification/osgi.cmpn/8.0.0/service.component.html#service.component-satisfying.condition
       - Added comprehensive documentation in README.md
       - Updated code comments to reflect specification compliance