Merge pull request ddnet#9393 from ChillerDragon/pr_flag_docs

Deobfuscate packet flag comment a bit

Author: heinrich5991

src/engine/shared/network.h

@@ -19,9 +19,19 @@ class CPacker;
 	packet header: 3 bytes
 		unsigned char flags_ack; // 6bit flags, 2bit ack
 			0.6:   ORNCaaAA
-			0.6.5: ORNCTUAA
+			0.6.5: ORNCT-AA
 			0.7:   --NORCAA
 
+		O = flag compression
+		R = flag resend
+		N = flag connless
+		C = flag control
+		T = flag token (0.6.5 only not supported by ddnet)
+		- = unused, should be zero
+		a = should be zero otherwise it messes up the ack number
+		A = bit of ack number
+
+
 		unsigned char ack; // 8 bit ack
 		unsigned char num_chunks; // 8 bit chunks