reflected the recent standard changes in the doc

ii-doc.txt

@@ -61,6 +61,11 @@ Response: newline-separated message ID list
 When a new message is posted to the echo, it gets appended to the end of the
 corresponding message ID list for this echo.
 
+The message order in an echo does not always match the timestamp ordering;
+it is fully up to the client on how to sort the messages internally. The
+messages are only guaranteed to be saved by the server in the order they
+arrive onto the server.
+
 - Listing messages in any amount of echos -
 
 Request: GET /u/e/echo.1.name/echo.2.name/...
@@ -77,7 +82,10 @@ msgid2fromecho2
 ...
 
 In case of limited request, the offset can be negative. E.g. -10:10 means
-requesting last 10 messages from the index.
+requesting last 10 messages from the index. If the offset:limit pair is not
+valid for a particular echo, all message IDs from this echo are returned.
+
+The same message ID ordering rule as for /e applies to /u/e as well. 
 
 - Fetching a single message by its ID -
 
@@ -90,6 +98,7 @@ Request: GET /u/m/msgid1/msgid2/...
 Response: newline-separated list of msgid:base64_msgtext
 
 Here, base64_msgtext is a Base64-encoded Node-to-Point Message (see below).
+The standardized ID count limit is at most 40 messages per bundle.
 
 - Posting a message (via POST) -
 
@@ -171,14 +180,4 @@ This algorithm must be implemented by every station to generate message IDs:
 4. Replace all occurrences of + or - with A, and / or _ with z.
 5. The result of these operations is your ii message ID.
 
-Implementation notes
---------------------
-* Most HTTP servers are configured to reject long GET lines, so tii passes a
-  limited amount of message IDs to the /u/m endpoints. This behaviour can be
-  configured in the stations.txt file.
-* The message order in an echo does not always match the timestamp ordering;
-  it is fully up to the client on how to sort the messages internally. The
-  messages are only guaranteed to be saved by the server in the order they
-  arrive onto the server.
-
 --- Luxferre ---