ext/[cd]*: fix a bunch of typos (#16298)

Only functional change is the renaming of the functions
`dom_document_substitue_entities_(read|write)` to replace `substitue` with
`substitut

ext/[cd]*: fix a bunch of typos (#16298)

Only functional change is the renaming of the functions
`dom_document_substitue_entities_(read|write)` to replace `substitue` with
`substitute`.

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Follow-up on GH-13516: include config.h from build dir for new files in ext-dom (#14705)

GH-13516 was created before the new DOM files were added, and the PR was
never rebased to include

Follow-up on GH-13516: include config.h from build dir for new files in ext-dom (#14705)

GH-13516 was created before the new DOM files were added, and the PR was
never rebased to include the new DOM files, so there are three places
which were not replaced.

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Implement Dom\Document::$title getter