encoding/base32: Add examples for Encode/Decode
encoding/base32: Add examples for Encode/Decode

Updates golang/go#37595

Change-Id: I7568e7416d5504e9dc67061c79f66e3a0d597dee
Reviewed-on: https://go-review.googlesource.com/c/go/+/351470
Run-TryBot: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>
TryBot-Result: Go Bot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>
Trust: David Chase <ae171625adc8645b8b79b7e405a6da5aba5341e0@google.com>

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