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A range of fixes. Turning off spell-checking for words that are too
close to real words to be added to the dictionary, and adding
exceptions for words we are likely to use again.

Link to cvs-fast-export documentation has changed and now points to
Reposurgeon. The source code is available and other documentation
describes how to use it.

The previous URL had two drawbacks:

1. It didn't match what the title was about (`Assignments to DevOps
   Stages and Groups`, and the anchor was `#designated-technical-writers`).
2. It didn't account for the other sections, like development and API
   guidelines.

This fixes typos in various places.

Update redirected and 404 links in import, integration
and various Plan docs.