This PR corrects misspellings identified by the check-spelling action. The misspellings have been reported at jsoref@b6ba3e2#commitcomment-48946465 The action reports that the changes in this PR would make it happy: jsoref@602417c Closes GH-6822.
They've been made obsolete by .stub.php files and are often outdated as they're not the source of truth.