message: Update a link to a commit in viewer/README.md
diff: @@ -8,7 +8,7 @@ We control the PDF viewers on both the tab and the browser through WebSockets in
  We provide additional features by setting up new event listeners in `latexworkshop.ts` for DOM objects in `viewer.html`. We do not and should not override functions defined by PDF.js.
  -We can see all the changes, [diff](https://github.com/James-Yu/LaTeX-Workshop/pull/2774/commits/f075b46caca2e39f3885d700faebebdb6316d840), [diff](https://github.com/James-Yu/LaTeX-Workshop/commit/600b8f2c3c530556a504ff8b47e870cc3ed2fe87), we have made to `viewer.js`. We had better find a way to achieve this without modifying `viewer.js`.
  +We can see all the changes, [diff](https://github.com/James-Yu/LaTeX-Workshop/commit/37e7ed27ad173ea85476f2c13e08ebc4e38f6185), [diff](https://github.com/James-Yu/LaTeX-Workshop/commit/600b8f2c3c530556a504ff8b47e870cc3ed2fe87), we have made to `viewer.js`. We had better find a way to achieve this without modifying `viewer.js`.
  #### Restoring the PDF viewer
  