lwip:refractor to the description about this menuconfig option

components/lwip/Kconfig

@@ -4,16 +4,17 @@ config L2_TO_L3_COPY
     bool "Enable copy between Layer2 and Layer3 packets"
     default 0
     help
-        If this feature is enabled, then all traffic from layer2(WIFI Driver)
-        to layer3(LWIP stack) will make a copy, the layer2 buffer will be
-        freed and the copy will be sent to layer3. Please be notified that the
-        total layer2 receiving buffer is fixed and ESP32 currently supports 25
-        layer2 receiving buffer, when layer2 buffer runs out of memory, then the 
-        incoming packets will be dropped in hardware. The layer3 buffer is 
-        allocated from the heap, so the total layer3 receiving buffer depends 
-        on the available heap size, when heap runs out of memory,  no copy will
-        be sent to layer3 and packet will be dropped in layer2. Please make sure
-        you fully understand the impact of this feature before enabling it.
+        If this feature is enabled, all traffic from layer2(WIFI Driver) will be
+        copied to a new buffer before sending it to layer3(LWIP stack), freeing
+        the layer2 buffer.
+        Please be notified that the total layer2 receiving buffer is fixed and 
+        ESP32 currently supports 25 layer2 receiving buffer, when layer2 buffer 
+        runs out of memory, then the incoming packets will be dropped in hardware. 
+        The layer3 buffer is allocated from the heap, so the total layer3 receiving
+        buffer depends on the available heap size, when heap runs out of memory,  
+        no copy will be sent to layer3 and packet will be dropped in layer2. 
+        Please make sure you fully understand the impact of this feature before 
+        enabling it.
 
 config LWIP_MAX_SOCKETS
     int "Max number of open sockets"