log: fix minor formatting in debug logs

Tidy a few debug log strings to avoid double spaces, concatenated status words, and mismatched format specifiers.

Co-authored-by: naiyoma <lankas.aurelia@gmail.com>

src/net.cpp

@@ -2397,7 +2397,7 @@ void CConnman::DumpAddresses()
 
     DumpPeerAddresses(::gArgs, addrman);
 
-    LogDebug(BCLog::NET, "Flushed %d addresses to peers.dat  %dms\n",
+    LogDebug(BCLog::NET, "Flushed %d addresses to peers.dat %dms",
              addrman.get().Size(), Ticks<std::chrono::milliseconds>(SteadyClock::now() - start));
 }