Merge #17833: doc: Added running functional tests in valgrind

155a11f doc: Added running functional tests in valgrind (Elichai Turkel)

Pull request description:

  Technically the notes only show an "example" of how to run valgrind with the suppression file,
  but now that bitcoin/bitcoin#17633 is merged then maybe this can encourage more people to run also the functional tests in valgrind

Top commit has no ACKs.

Tree-SHA512: b8417249b720d0ed5e10b732648f2e07e8889bfc7aa7e94192d1c049b4b7837971678d30c535f273c227848f1290cf11e14369fd6c1924b734f2e47e2af41401

Author: MarcoFalke

doc/developer-notes.md

@@ -288,6 +288,7 @@ $ valgrind --suppressions=contrib/valgrind.supp src/test/test_bitcoin
 $ valgrind --suppressions=contrib/valgrind.supp --leak-check=full \
       --show-leak-kinds=all src/test/test_bitcoin --log_level=test_suite
 $ valgrind -v --leak-check=full src/bitcoind -printtoconsole
+$ ./test/functional/test_runner.py --valgrind
 ```
 
 ### Compiling for test coverage