Adds links to useful fuzzers to sheriff guide.

Change-Id: Ie2c42ef76f31cfc3b0e3c7f2a720efb61c50e5cf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2072129Reviewed-by: Varun Khaneja <vakh@chromium.org>
Commit-Queue: Alex Gough <ajgo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#744849}

docs/security/sheriff.md

@@ -204,7 +204,12 @@ Tips for reproducing bugs:
   allows you to upload files to reproduce crashes on various platforms and will
   identify revision ranges when the regression was introduced. If a test case
   requires multiple files, they can be uploaded together in a zip or tar
-  archive.
+  archive. Useful fuzzers include:-
+    * repro.html [linux_asan_chrome_mp](https://clusterfuzz.com/upload-testcase?upload=true&job=linux_asan_chrome_mp)
+    or [windows_asan_chrome](https://clusterfuzz.com/upload-testcase?upload=true&job=windows_asan_chrome)
+    * repro.js [linux_asan_d8](https://clusterfuzz.com/upload-testcase?upload=true&job=linux_asan_d8)
+    * repro.pdf [libfuzzer_pdfium_asan / pdfium_fuzzer](https://clusterfuzz.com/upload-testcase?upload=true&job=libfuzzer_pdfium_asan&target=pdfium_fuzzer)
+    or [libfuzzer_pdfium_asan / pdfium_xfa_fuzzer](https://clusterfuzz.com/upload-testcase?upload=true&job=libfuzzer_pdfium_asan&target=pdfium_xfa_fuzzer)
 * When you can't just build from a specific branch locally, check out
   [https://dev.chromium.org/getting-involved/dev-channel](https://dev.chromium.org/getting-involved/dev-channel)
   or