[README] Fix internal link to Verification section

[kdmukai]

Description

The internal link at the table of contents to the verification section was broken; Markdown references only work when the "#" anchor matches the subhead text it's referring to.

This simplified section title also makes it easy to link to this section from elsewhere (e.g. the release notes).

Also minor comma usage edits that my eye happened to catch. A follow-up round of light edits and simplifications is probably overdue.

---

I think this whole README could use some trimming down. The verification instructions could easily be pulled out into their own doc.

---

This pull request is categorized as a:

• Bug fix
• Documentation

Checklist

I’ve run pytest and made sure all unit tests pass before sumbitting the PR

• N/A

If you modified or added functionality/workflow, did you add new unit tests?

• N/A

I have tested this PR on the following platforms/os:

• N/A

[newtonick]

ACK