Update instances of readthedocs.org to readthedocs.io in documentation

Description

Per closed PR 1308, instances of readthedocs.org need to be replaced with readthedocs.io. (Closed PR 1308 because of difficulty checking out branch and resolving merge conflicts.) This isn't urgent, since the .com links still work.

Steps to Reproduce

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Current Behavior

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Expected Behavior

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Reason for Variance

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Release Notes

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User Impact Summary

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Status

Assignee

Grant Goodman

Reporter

Sylvia Pearce

Reach

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Impact

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Platform Map Area (Levels 3 & 4)

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Story Points

1

Epic Link

Priority

CAT-4
Configure