fixup! add issue link to test

Author: Michael137

lldb/test/Shell/Recognizer/registration-unique.test

@@ -46,7 +46,7 @@ frame recognizer list
 # CHECK-NOT: Verbose Trap StackFrame Recognizer
 # CHECK-NOT: Assert StackFrame Recognizer
 
-# FIXME: avoid duplicate frame recognizers in the target.
+# FIXME: avoid duplicate frame recognizers in the target: https://github.com/llvm/llvm-project/issues/166341
 # CHECK: frame recognizer list
 # CHECK: Verbose Trap StackFrame Recognizer
 # CHECK: Assert StackFrame Recognizer