docs, net-binding-plugins: Fix links

[EdDev]

What this PR does / why we need it:

Fix links in the documentation of the network binding plugins.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

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Release note:

NONE

[aburdenthehand]

/lgtm
btw I hit these while changing all xrefs for #794 (there's also a (#register) xref in both of these files that are in the same boat). If/when that merges it becomes moot but it makes sense to merge this in the interim. Thanks for the fix!

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PR needs rebase.

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[dhiller]

@EdDev thank you for this!

/approve

Unfortunately this PR requires a rebase now - would you be able to do that?

/hold

Afterwards please ping me and I'll take another look!

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dhiller

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