Remove unnecessary comment

The debug confusion persists with even simpler examples e.g.
TOML.decode @int "3". Thus it has nothing to do with our code
and simply a user error.

src/Pacer/Command/Chart/Data/Time.hs

@@ -137,10 +137,6 @@ instance DecodeTOML Timestamp where
       <|> TimestampZoned
       <$> tomlDecoder
 
--- TODO: Why does this fail???
---
--- TOML.decode @Timestamp "2024-10-20T14:30:00"
-
 instance Parser Timestamp where
   -- reuse toml instance since it is already done for us upstream.
   parser = do