Fix networking documentation

docs/src/multiplayer/connector/protocol.md

@@ -27,15 +27,23 @@ can be encoded within three bytes, after which the counter resets to 0. The ID
 sequence for reliable and unreliable packages are independent. Each connection
 / client has independent reliable package numbering.
 
-Packages can be transmitted in either reliable or non-reliable mode.
-Reliability is signaled by the second highest bit of the flags byte
-(represented by the mask `0b0100_0000`). Packages sent in reliable mode always
-receive confirmation from the receiving party and are retransmitted multiple
-times, with the time delay exponentially increasing until a confirmation is
-obtained. Reliably sent packages are automatically deduplicated.
-
-Packages can be targeted to the server. This is signaled by the third highest
-bit of the flags byte (represented by the mask `0b0010_0000`). All other
+Packages can be transmitted in several reliability modes as listed below. The
+second and the third bit (represented by the mask `0b0110_0000`) of the flags
+byte control the reliability.
+
+* Unreliable (bits `00`) – these packages may be lost, delivered multiple times
+  or delivered out of order with respect to other packages.
+* Unordered (bits `01`) – non-duplicate delivery of these packages is
+  guaranteed. There are not guarantees on ordering of these packages with
+  respect to other packages.
+* Semi-ordered (bits `10`) – non-duplicate delivery of these packages is
+  guaranteed. The packages are also guaranteed to be delivered after all
+  previously reliably sent packages (id est all unordered and semi-ordered
+  packages sent by the same client before a semi-ordered package are always
+  delivered before the semi-ordered package).
+
+Packages can be targeted to the server. This is signaled by the fourth highest
+bit of the flags byte (represented by the mask `0b0001_0000`). All other
 packages are targeted to all other players who joined the same game.
 
 Package payload comprises the user data intended for delivery.