Merge bitcoin/bitcoin#32083: doc: shallow clone qa-assets

6f9f415 doc: shallow clone qa-assets (Lőrinc)

Pull request description:

  While reviewing bitcoin/bitcoin#31457 (review) I noticed that cloning `qa-assets` takes a lot of time - shallow cloning should suffice here.

  I haven't checked the other clones in this file but suggestion are welcome.

ACKs for top commit:
  maflcko:
    lgtm ACK 6f9f415

Tree-SHA512: 21bd676c7709dbf7fd30b239d0a72f9c230453ed8f8a1b5319ac92ef9c5e67780939f095a239dd31bcb4550f8d69eaed4931a221e19cb0b957f18fac623c4a01

Author: fanquake

doc/fuzzing.md

@@ -89,7 +89,7 @@ The project's collection of seed corpora is found in the [`bitcoin-core/qa-asset
 To fuzz `process_message` using the [`bitcoin-core/qa-assets`](https://github.com/bitcoin-core/qa-assets) seed corpus:
 
 ```sh
-$ git clone https://github.com/bitcoin-core/qa-assets
+$ git clone --depth=1 https://github.com/bitcoin-core/qa-assets
 $ FUZZ=process_message build_fuzz/bin/fuzz qa-assets/fuzz_corpora/process_message/
 INFO: Seed: 1346407872
 INFO: Loaded 1 modules   (424174 inline 8-bit counters): 424174 [0x55d8a9004ab8, 0x55d8a906c3a6),