message: Change "offset" command description in consumer
diff: @@ -34,7 +34,7 @@ pub struct ConsumeLogOpt {
  #[structopt(short = "d", long)]
  pub disable_continuous: bool,
  - /// optional, offset, negate offset is relative to end offset (either committed or uncommitted)
  + /// Offsets can be positive or negative. (Syntax for negative offset: --offset="-1")
  #[structopt(short, long, value_name = "integer")]
  pub offset: Option<i64>,
  