Fix spelling errors

[jsoref]

Fixes misspellings identified by the check-spelling action.

The misspellings have been reported at https://github.com/jsoref/foundationdb/actions/runs/8369784065#summary-22916088879

The action will report that the changes in this PR would make it happy: https://github.com/jsoref/foundationdb/actions/runs/8369784265#summary-22916089515

Code-Reviewer Section

The general pull request guidelines can be found here.

Please check each of the following things and check all boxes before accepting a PR.

• The PR has a description, explaining both the problem and the solution.
• The description mentions which forms of testing were done and the testing seems reasonable.
• Every function/class/actor that was touched is reasonably well documented.
  -- I'm not going to make this claim -- I'm only fixing spelling errors, and sometimes I couldn't figure out the correct spelling based on the documentation...

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• This change/bugfix is a cherry-pick from the next younger branch (younger release-branch or main if this is the youngest branch)
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