sniff: cliean up some implementation comments

[skip ci]

src/cmd/sniff.rs

@@ -359,7 +359,7 @@ async fn get_file_to_sniff(args: &Args, tmpdir: &tempfile::TempDir) -> CliResult
  #[allow(clippy::cast_precision_loss)]
  let lines_sample_size = if snappy_flag {
  // if it's a snappy compressed file, we need to download the entire file
- // to sniff it
+ // to uncompress and sniff it
  usize::MAX
  } else if args.flag_sample > 1.0 {
  args.flag_sample.round() as usize
@@ -725,9 +725,8 @@ async fn sniff_main(mut args: Args) -> CliResult<()> {
  let sfile_info = block_on(future)?;
  let tempfile_to_delete = sfile_info.file_to_sniff.clone();
 
- // if we have a detected mime type earlier, we can skip the sniffing
- // unless it was a snappy file and --no-infer is disabled,
- // as we need to sniff the uncompressed file
+ // if we don't have a mime type or its a snappy file and --no-infer is disabled,
+ // let's try to infer the mime type
  let file_type = if sfile_info.detected_mime.is_empty()
  || sfile_info.detected_mime == "application/x-snappy-framed" && !args.flag_no_infer
  {
@@ -879,6 +878,7 @@ async fn sniff_main(mut args: Args) -> CliResult<()> {
  _ => qsv_sniffer::metadata::Quote::None,
  };
 
+ // now that we have all the sniffing parameters, we can sniff the file
  let sniff_results = if sample_all {
  log::info!("Sniffing ALL rows...");
  if let Some(delimiter) = args.flag_delimiter {