Fix hyperlinks from pr-699

[kprosise]

References and external links fixed to use correct syntax. Also minor grammar fix on a line containing one of the broken links.

No related tickets, quick fix.

QA: ran linkcheck and viewed rendered html.

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Overview

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Checklist

• Run spelling and grammar check, preferably with linter.
• Avoid changing any header associated with a link/reference.
• Match tone and style of page/section.
• Run make linkcheck.
• View HTML in a browser to check rendering.
• Use semantic newlines.
• follow best practices for commits.
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[doanac]

Docs for 444e81f are browsable at: https://ci.foundries.io/projects/fio-docs/builds/2782/docs/artifacts/html/index.html