doc/go1.22: add TODOs for missing APIs

doc/go1.22: add TODOs for missing APIs

Add TODOs for APIs mentioned in api/go1.22.txt but missing from the
release notes.

The issue list was generated with:

    $ awk '{print substr($NF, 2, length($NF)-1)}' < ../api/go1.22.txt | uniq | xargs -I{} sh -c 'echo -n "{}: " && grep -c {} ../doc/go1.22.html'

For #61422.

Change-Id: I85d41c28530e6b5e3e388a41206b251278c91dd5
Reviewed-on: https://go-review.googlesource.com/c/go/+/548937
Auto-Submit: Michael Pratt <mpratt@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>