doc/go1.14: mention new method encoding/json.Decoder.InputOffset
doc/go1.14: mention new method encoding/json.Decoder.InputOffset

Updates #29688
Updates #36878

Change-Id: I230889ec3f1c183dc5adbc662a39a791c0488497
Reviewed-on: https://go-review.googlesource.com/c/go/+/217123
Reviewed-by: Alexander Rakoczy <60c6d277a8bd81de7fdde19201bf9c58a3df08f4@golang.org>

nawawi/go,CAFxX/go,golang/go,golang/go,golang/go,akutz/go,akutz/go,CAFxX/go,golang/go,cloudflare/go,golang/go,nawawi/go,cloudflare/go,CAFxX/go,nawawi/go,cloudflare/go,cloudflare/go,nawawi/go,akutz/go,CAFxX/go,CAFxX/go,akutz/go,akutz/go,akutz/go,golang/go,nawawi/go,CAFxX/go,cloudflare/go,cloudflare/go,cloudflare/go,golang/go,nawawi/go,nawawi/go,CAFxX/go,akutz/go,golang/go,akutz/go,cloudflare/go,nawawi/go,CAFxX/go