RTCM_Test: Fix comment

Author: LeeLeahy2

Examples/RTCM_Test/RTCM_Test.ino

@@ -44,7 +44,7 @@ const uint8_t rawDataStream[] =
     0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x05, 0xb4,
     0x59, 0x88, 0x0f, 0xe1, 0x13,
 
-    // Valid bad message length
+    // Bad message length
     0xd3, 0x20, 0x13, 0x3e, 0xd0, 0x00, 0x03, 0x8e,
     0xd9, 0xaa, 0x78, 0x90, 0x80, 0x00, 0x00, 0x00,
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3b, 0xc6,