Update ASGI spec with new process-local channels definition

docs/asgi.rst

@@ -127,7 +127,7 @@ is made between channels that have multiple readers (such as the
 ``http.request`` channel that web applications would listen on from every
 application worker process), *single-reader channels* that are read from a
 single unknown location (such as ``http.request.body?ABCDEF``), and
-*process-specific channels* (such as a ``http.response!ABCDEF`` channel
+*process-specific channels* (such as a ``http.response.A1B2C3!D4E5F6`` channel
 tied to a client socket).
 
 *Normal channel* names contain no type characters, and can be routed however
@@ -146,19 +146,16 @@ channel to a server, but reads from this channel by a single process must
 always be in-order and return messages if the channel is non-empty. These names
 must be generated by the ``new_channel`` call.
 
-*Process-specific channel* names contain an exclamation mark
-(``!``) character in order to indicate to the channel layer that it may
-have to route the data for these channels differently to ensure it reaches the
-single process that needs it; these channels are nearly always tied to
-incoming connections from the outside world. The ``!`` is always preceded by
-the main channel name (e.g. ``http.response``) and followed by the
-per-client/random portion - channel layers can split on the ``!`` and use just
-the right hand part to route if they desire, or can ignore it if they don't
-need to use different routing rules. Even if the right hand side contains
-client routing information, it must still contain random parts too so that
-each call to ``new_channel`` returns a new, unused name. These names
-must be generated by the ``new_channel`` call; they are guaranteed to only
-be read from the same process that calls ``new_channel``.
+*Process-specific channel* names contain an exclamation mark (``!``) that
+separates a remote and local part. These channels are received differently;
+only the name up to and including the ``!`` character is passed to the
+``receive()`` call, and it will receive any message on any channel with that
+prefix. This allows a process, such as a HTTP terminator, to listen on a single
+process-specific channel, and then distribute incoming requests to the
+appropriate client sockets using the local part (the part after the ``!``).
+The local parts must be generated and managed by the process that consumes them.
+These channels, like single-reader channels, are guaranteed to give any extant
+messages in order if received from a single process.
 
 Messages should expire after a set time sitting unread in a channel;
 the recommendation is one minute, though the best value depends on the

docs/asgi/www.rst

@@ -128,7 +128,7 @@ Send after any server pushes, and before any response chunks. If ``ChannelFull``
 is encountered, wait and try again later, optionally giving up after a
 predetermined timeout.
 
-Channel: ``http.response!``
+Channel: Defined by server, suggested ``http.response.RANDOMPART!CLIENTID``
 
 Keys:
 
@@ -154,7 +154,7 @@ Response Chunk
 Must be sent after an initial Response. If ``ChannelFull``
 is encountered, wait and try again later.
 
-Channel: ``http.response!``
+Channel: Defined by server, suggested ``http.response.RANDOMPART!CLIENTID``
 
 Keys:
 
@@ -194,7 +194,7 @@ If the remote peer does not support server push, either because it's not a
 HTTP/2 peer or because SETTINGS_ENABLE_PUSH is set to 0, the server must do
 nothing in response to this message.
 
-Channel: ``http.response!``
+Channel: Defined by server, suggested ``http.response.RANDOMPART!CLIENTID``
 
 Keys:
 
@@ -372,7 +372,7 @@ If received while the connection is established:
   any send.
 * ``accept`` is ignored.
 
-Channel: ``websocket.send!``
+Channel: Defined by server, suggested ``websocket.send.RANDOMPART!CLIENTID``
 
 Keys: