check to see if we find check syntax-recorded documentation at some p…

…osition

as we look backwards for documentation and use that, if we have it

(this can have a large impact on certain files)

drracket/drracket/private/syncheck/blueboxes-gui.rkt

@@ -538,6 +538,7 @@
              (path->module-path require-candidate #:cache (get-path->pkg-cache))))
          (let loop ([pos pos])
            (cond
+             [(interval-map-ref (get/start-docs-im) pos #f) => values]
              [(member (classify-position pos) '(symbol keyword))
               (define-values (start end) (get-token-range pos))
               (cond