doc: fix top-level bits documentation and add update CHANGELOG

CHANGELOG.md

@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Made bits.Mask() function public
 - New counter methods added to bits.Reader
 - colr box support for nclc and unknown colour_type
+- av01, encv, and enca direct pointers in stsd
 
 ### Changed
 

bits/doc.go

@@ -1,9 +1,9 @@
 /*
 Package bits - bit and bytes reading and writing including Golomb codes and EBSP.
-All readaer and writer accumulates errors in the sense that they will stop reading or writing at the first error.
-The first error can be retrieved with AccError().
+All readers and writers accumulate errors in the sense that they will stop reading or writing at the first error.
+The first error, if any, can be retrieved with AccError().
 
-Beyond plain bit reading and writing, reading and writing of ebsp (Encapsulated Byte Sequence Packets)
-with start-code emulation prevention bytes and exponential Golomb codes as used in the AVC/H.264 and HEVC video coding standards.
+Beyond plain bit reading and writing, reading and writing of ebsp (Encapsulated Byte Sequence Packets) is supported.
+EBSP uses insertion of start-code emulation prevention bytes 0x03 and is used in MPEG video standards from AVC (H.264) and forward.
 */
 package bits