Use consistent wording in log

src/random.cpp

@@ -97,7 +97,7 @@ static void ReportHardwareRand()
     // This must be done in a separate function, as InitHardwareRand() may be indirectly called
     // from global constructors, before logging is initialized.
     if (g_rdseed_supported) {
-        LogPrintf("Using RdSeed as additional entropy source\n");
+        LogPrintf("Using RdSeed as an additional entropy source\n");
     }
     if (g_rdrand_supported) {
         LogPrintf("Using RdRand as an additional entropy source\n");