encoding/binary: add documentation for endian methods
While the comments are on an unexported type, gopls correctly
shows them when using the exported vars LittleEndian and BigEndian.
Fixes #68083
Change-Id: I53668c3140ad00f7b58437be74e6df773e2916f1
GitHub-Last-Rev:
cef717123cdc632b59683f4ce55aee6c286ca4c7
GitHub-Pull-Request: golang/go#71058
Reviewed-on: https://go-review.googlesource.com/c/go/+/638936
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Jorropo <jorropo.pgm@gmail.com>