Update comments; trivial addtion to a document.

Documentation/NuttXCCodingStandard.html

@@ -162,10 +162,10 @@
     Pre-processor Definitions
   </li>
   <li>
-    Private Types
+    Private Types (definitions)
   </li>
   <li>
-    Private Function Prototypes
+    Private Function Prototypes (declarations)
   </li>
   <li>
     Private Data (definitions)
@@ -191,7 +191,7 @@
     Pre-processor Definitions
   </li>
   <li>
-    Public Types
+    Public Types (definitions)
   </li>
   <li>
     Public Data (declarations)
@@ -217,7 +217,7 @@
 <ul>
   <li>
     <p>
-      Each header file must contain the following pre-processor commands near the beginning of the header file:  Between the file header and the &quot;Included Files&quot; block comment.
+      Each header file must contain the following pre-processor conditional logic near the beginning of the header file:  Between the file header and the &quot;Included Files&quot; block comment.
       For example,
     </p>
     <ul><pre>

net/tcp/tcp_input.c

@@ -73,7 +73,7 @@
  * Parameters:
  *   dev   - The device driver structure containing the received TCP packet.
  *   tcp   - A pointer to the TCP header in the packet
- *   tcpiplen - Combined length of the IP and TCP headers
+ *   iplen - Combined length of the IP and TCP headers
  *
  * Return:
  *   None

net/udp/udp_input.c

@@ -69,7 +69,7 @@
  * Parameters:
  *   dev   - The device driver structure containing the received UDP packet
  *   udp   - A pointer to the UDP header in the packet
- *   udpiplen - Length of the IP and UDP headers
+ *   iplen - Length of the IP and UDP headers
  *
  * Return:
  *   OK  The packet has been processed  and can be deleted