iter: fix a tiny doc comment bug
Use the right name for method Pos.Value in a sample doc comment in the package overview.
Fixes #76187.
Change-Id: Id1f5b0ca4ea39493b10140bc304c57c081c805ee
GitHub-Last-Rev:
7bf5d0774749111cd13e40700b31a5a83c288db9
GitHub-Pull-Request: golang/go#76195
Reviewed-on: https://go-review.googlesource.com/c/go/+/718321
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Alan Donovan <adonovan@google.com>
Auto-Submit: Alan Donovan <adonovan@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>