doc: show how to build the fuzzers

BUG=None

No-Try: true
Change-Id: I5a5007263c88678d76edc97fbcda96ff967071df
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/206420
Commit-Queue: Philipp Hancke <philipp.hancke@googlemail.com>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#33293}
diff --git a/docs/native-code/development/index.md b/docs/native-code/development/index.md
index 3c7a534..c51c92a 100644
--- a/docs/native-code/development/index.md
+++ b/docs/native-code/development/index.md
@@ -98,6 +98,12 @@
 $ gn clean out/Default
 ```
 
+To build the fuzzers residing in the [test/fuzzers][fuzzers] directory, use
+```
+$ gn gen out/fuzzers --args='use_libfuzzer=true optimize_for_fuzzing=true'
+```
+Depending on the fuzzer additional arguments like `is_asan`, `is_msan` or `is_ubsan_security` might be required.
+
 See the [GN][gn-doc] documentation for all available options. There are also more
 platform specific tips on the [Android][webrtc-android-development] and
 [iOS][webrtc-ios-development] instructions.
@@ -268,3 +274,4 @@
 [rfc-5766]: https://tools.ietf.org/html/rfc5766
 [m80-log]: https://webrtc.googlesource.com/src/+log/branch-heads/3987
 [m80]: https://webrtc.googlesource.com/src/+/branch-heads/3987
+[fuzzers]: https://chromium.googlesource.com/external/webrtc/+/refs/heads/master/test/fuzzers/