docs: "Fuzzing the Bitcoin Core P2P layer using Honggfuzz NetDriver" is outdated #28019

Due to changes to the functions V1TransportDeserializer::readHeader and V1TransportDeserializer::GetMessage, the "Fuzzing the Bitcoin Core P2P layer using Honggfuzz NetDriver" section in fuzzing.md is outdated. The git apply command doesn't work.

$ git apply << "EOF"
diff --git a/src/bitcoind.cpp b/src/bitcoind.cpp
index 455a82e39..2faa3f80f 100644
--- a/src/bitcoind.cpp
+++ b/src/bitcoind.cpp
@@ -158,7 +158,11 @@ static bool AppInit(int argc, char* argv[])
     return fRet;
 }

+#ifdef HFND_FUZZING_ENTRY_FUNCTION_CXX
+HFND_FUZZING_ENTRY_FUNCTION_CXX(int argc, char* argv[])
+#else
 int main(int argc, char* argv[])
+#endif
 {
 #ifdef WIN32
     util::WinCmdLineArgs winArgs;
diff --git a/src/net.cpp b/src/net.cpp
index cf987b699..636a4176a 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -709,7 +709,7 @@ int V1TransportDeserializer::readHeader(const char *pch, unsigned int nBytes)
     }

     // Check start string, network magic
-    if (memcmp(hdr.pchMessageStart, m_chain_params.MessageStart(), CMessageHeader::MESSAGE_START_SIZE) != 0) {
+    if (false && memcmp(hdr.pchMessageStart, m_chain_params.MessageStart(), CMessageHeader::MESSAGE_START_SIZE) != 0) { // skip network magic checking
         LogPrint(BCLog::NET, "HEADER ERROR - MESSAGESTART (%s, %u bytes), received %s, peer=%d\n", hdr.GetCommand(), hdr.nMessageSize, HexStr(hdr.pchMessageStart), m_node_id);
         return -1;
     }
@@ -768,7 +768,7 @@ Optional<CNetMessage> V1TransportDeserializer::GetMessage(const std::chrono::mic
     RandAddEvent(ReadLE32(hash.begin()));

     // Check checksum and header command string
-    if (memcmp(hash.begin(), hdr.pchChecksum, CMessageHeader::CHECKSUM_SIZE) != 0) {
+    if (false && memcmp(hash.begin(), hdr.pchChecksum, CMessageHeader::CHECKSUM_SIZE) != 0) { // skip checksum checking
         LogPrint(BCLog::NET, "CHECKSUM ERROR (%s, %u bytes), expected %s was %s, peer=%d\n",
                  SanitizeString(msg->m_command), msg->m_message_size,
                  HexStr(Span<uint8_t>(hash.begin(), hash.begin() + CMessageHeader::CHECKSUM_SIZE)),
EOF