slices: update doc for Delete and Replace
Fixes #64013
Change-Id: Ibaeaad6120bff041bf6ab80fd4cd613f7d4ac5a7
GitHub-Last-Rev:
647ed646ec7c2e4ce93c5d3847d0b9e3627d7497
GitHub-Pull-Request: golang/go#64024
Reviewed-on: https://go-review.googlesource.com/c/go/+/540955
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Jes Cok <xigua67damn@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Keith Randall <khr@golang.org>
Reviewed-by: Eli Bendersky <eliben@google.com>