message: fix grammatical problem
diff: @@ -36,7 +36,7 @@ impl<'de> de::Visitor<'de> for DurationVisitor {
  }
  }
  -/// Deserialize `std::time::Duration` from millisecond(represented as u64)
  +/// Deserialize `std::time::Duration` from milliseconds (represented as u64)
  pub(in crate) fn from_duration_ms<'de, D>(d: D) -> Result<Duration, D::Error>
  where
  D: de::Deserializer<'de>,
  @@ -44,7 +44,7 @@ where
  d.deserialize_u64(DurationVisitor)
  }
  -/// Serialize `std::time::Duration` to millisecond(represented as u64)
  +/// Serialize `std::time::Duration` to milliseconds (represented as u64)
  pub(in crate) fn to_duration_ms<S>(x: &Duration, s: S) -> Result<S::Ok, S::Error>
  where
  S: Serializer,
  @@ -120,7 +120,7 @@ impl<'de> de::Visitor<'de> for OptionDurationVisitor {
  }
  }
  -/// Deserialize `Option<std::time::Duration>` from millisecond(represented as u64)
  +/// Deserialize `Option<std::time::Duration>` from milliseconds (represented as u64)
  pub(in crate) fn from_option_duration_ms<'de, D>(d: D) -> Result<Option<Duration>, D::Error>
  where
  D: de::Deserializer<'de>,
  @@ -128,7 +128,7 @@ where
  d.deserialize_option(OptionDurationVisitor)
  }
  -/// Serialize `Option<std::time::Duration>` to millisecond(represented as u64)
  +/// Serialize `Option<std::time::Duration>` to milliseconds (represented as u64)
  pub(in crate) fn to_option_duration_ms<S>(x: &Option<Duration>, s: S) -> Result<S::Ok, S::Error>
  where
  S: Serializer,
  