Clarify comments

Author: multiplemonomials

connectivity/drivers/emac/TARGET_NUVOTON_EMAC/TARGET_M480/NuvotonM480EthMAC.cpp

@@ -77,7 +77,7 @@ CompositeEMAC::ErrCode NuvotonM480EthMAC::MACDriver::init() {
                     EMAC_CAMCTL_ABP_Msk;
 
     // Maximum frame length.
-    // Don't know exactly why, but need to set this 4 bytes higher than the MTU of 1514 bytes
+    // This apparently includes the CRC, so we need to set this 4 bytes higher than the MTU of 1514 bytes
     // or 1514 byte packets get rejected
     base->MRFL = 1518;
 

connectivity/netsocket/mbed_lib.json5

@@ -124,7 +124,7 @@
             // The M480 EMAC sadly does not support splitting one frame across multiple Rx descriptors.
             // So, we need to make each Rx descriptor large enough to fit a max size Ethernet packet.
             // Normally that would be 1518 (1514 byte MTU plus 4 bytes for alignment overhead), but this EMAC also always 
-            // receives the CRC (plus other stuff??) at the end of the packet, with no way to turn it off. So, we need an extra 6 
+            // receives the CRC and length at the end of the packet, with no way to turn it off. So, we need an extra 6 
             // bytes padding that can be clobbered here.
             "emac-rx-pool-buf-size": 1524,
         }