#1450: fix two stale doc comments in mpegts

Unit.pos for transport streams is a byte offset (scan stores off + k *
packet_size), not a packet index; frame_bytes carried the doc line of
frame_info above its own.

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>

crates/mpegts/src/es.rs

@@ -174,7 +174,6 @@ pub struct FrameInfo {
 
 const ADTS_RATES: [u32; 13] = [96_000, 88_200, 64_000, 48_000, 44_100, 32_000, 24_000, 22_050, 16_000, 12_000, 11_025, 8_000, 7_350];
 
-/// Parse the frame header at the start of `b` (MPEG audio, ADTS, AC-3, E-AC-3).
 /// Bytes of the audio frame whose header starts `b` (MPEG audio, ADTS, LATM, AC-3, E-AC-3), or
 /// `None` without a valid header there. For containers that store frames in chunks that need not
 /// follow them (AVI): the frames are found again with it.

crates/mpegts/src/lib.rs

@@ -218,7 +218,7 @@ pub struct Unit {
     /// No other unit depends on it (B pictures of MPEG-1/2 video, non-reference H.264/HEVC).
     pub disposable: bool,
     pub size: u32,
-    /// TS: index of the packet holding the first byte; PS: byte offset of its PES packet.
+    /// TS: byte offset of the packet holding the first byte; PS: byte offset of its PES packet.
     pub(crate) pos: u64,
     /// Offset of the first byte within that packet's elementary-stream payload.
     pub(crate) offset: u32,