Update src/log.cr

Co-authored-by: Sijawusz Pur Rahnama <sija@sija.pl>

src/log.cr

@@ -80,7 +80,7 @@
 #
 # If you need to change the default level, backend or sources call `Log.setup` upon startup.
 #
-# NOTE: Calling setup will override previous setup calls.
+# NOTE: Calling `setup` will override previous `setup` calls.
 #
 # ```
 # Log.setup(:debug)                     # Log debug and above for all sources to STDOUT