Merge pull request #5646 from Snuffleupagus/disableAutoFetch-streaming-docs

Amend the docs for |disableAutoFetch| to mention that streaming must also be disabled

src/display/api.js

@@ -99,6 +99,9 @@ PDFJS.disableStream = (PDFJS.disableStream === undefined ?
  * Disable pre-fetching of PDF file data. When range requests are enabled PDF.js
  * will automatically keep fetching more data even if it isn't needed to display
  * the current page. This default behavior can be disabled.
+ *
+ * NOTE: It is also necessary to disable streaming, see above,
+ *       in order for disabling of pre-fetching to work correctly.
  * @var {boolean}
  */
 PDFJS.disableAutoFetch = (PDFJS.disableAutoFetch === undefined ?