(checkdoc-eval-defun): Call eval-defun

(checkdoc-eval-defun): Call eval-defun
interactively so that C-u M-C-x still does edebug.
(checkdoc-sentencespace-region-engine): Don't force a double-space
after `.' if it doesn't look like an end-of-sentence.
(debug-ignored-errors): Add `disambiguate ...'.