logrus: use lower-case in comments and examples

hooks/syslog/README.md

@@ -36,4 +36,4 @@ func main() {
     log.Hooks.Add(hook)
   }
 }
-```
+```

hooks/test/test.go

@@ -1,3 +1,6 @@
+// The Test package is used for testing logrus. It is here for backwards
+// compatibility from when logrus' organization was upper-case. Please use
+// lower-case logrus and the `null` package instead of this one.
 package test
 
 import (