remove stale fixme

src/mesh/RadioInterface.h

@@ -58,7 +58,7 @@ class RadioInterface
     uint8_t sf = 9;
     uint8_t cr = 7;
 
-    uint16_t preambleLength = 32; // 8 is default, but FIXME use longer to increase the amount of sleep time when receiving
+    uint16_t preambleLength = 32; // 8 is default, but we use longer to increase the amount of sleep time when receiving
 
     MeshPacket *sendingPacket = NULL; // The packet we are currently sending
     uint32_t lastTxStart = 0L;