Merge bitcoin/bitcoin#21947: doc: Fix OSS-Fuzz links

fadd98d doc: Fix OSS-Fuzz links (MarcoFalke)

Pull request description:

  * Add missing link to the coverage report
  * Replace unqualified link with qualified one

ACKs for top commit:
  practicalswift:
    ACK fadd98d
  jarolrod:
    ACK fadd98d

Tree-SHA512: 5d5138288ae75d6a9ae536f307a63813ffe60c628a8c9a74b33f0d1be1a34fac2ff5eca9c9fe64be3139f2251736ba088c5f3731f0b3f50c70c5a5f1a89f0ea4

Author: fanquake

doc/fuzzing.md

@@ -234,11 +234,13 @@ $ honggfuzz/honggfuzz --exit_upon_crash --quiet --timeout 4 -n 1 -Q \
 # OSS-Fuzz
 
 Bitcoin Core participates in Google's [OSS-Fuzz](https://github.com/google/oss-fuzz/tree/master/projects/bitcoin-core)
-program, which includes a dashboard of [publicly disclosed vulnerabilities](https://bugs.chromium.org/p/oss-fuzz/issues/list).
+program, which includes a dashboard of [publicly disclosed vulnerabilities](https://bugs.chromium.org/p/oss-fuzz/issues/list?q=bitcoin-core).
 Generally, we try to disclose vulnerabilities as soon as possible after they
 are fixed to give users the knowledge they need to be protected. However,
 because Bitcoin is a live P2P network, and not just standalone local software,
 we might not fully disclose every issue within Google's standard
 [90-day disclosure window](https://google.github.io/oss-fuzz/getting-started/bug-disclosure-guidelines/)
 if a partial or delayed disclosure is important to protect users or the
 function of the network.
+
+OSS-Fuzz also produces [a fuzzing coverage report](https://oss-fuzz.com/coverage-report/job/libfuzzer_asan_bitcoin-core/latest).