Tweak docs.

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+FujiNetChat is inspired by irssi. However, since it runs on a tiny
+8-bit platform, it can't do all the things irssi does. Here's a
+partial list of the user-visible differences.
+
+- Can't connect to multiple servers.
+- No /server command (you have to run the config tool to change
+  servers; this may change in future).
+- Most preferences can't be changed from within the client (have to
+  use the config tool). Exceptions: nick and alert type.
+- No SASL auth support.
+- Obviously, no scripting.
+- No DCC.
+- No logging.
+- No color.
+- You only get 7 screens (windows).
+- Can't disable the server screen.
+- No auto-rejoin on when kicked.
+- No auto-reconnect when disconnected (you have to press a key to
+  reconnect). This will change.
+- There's a [private] screen for all PMs which don't have a /query.
+- /query <nick> <message> doesn't work (yet). It creates a query but
+  doesn't (yet) send the initial message.
+- Getting PMed doesn't create a screen (use Start+Q to do that).
+- Closing a screen doesn't /part the channel (it "moves" to [server]).
+- No command history (up-arrow) or cutbuffer (^Y).
+- No local nick list, which means tab-completion is limited, and
+  that we can't keep track of who's opped or voiced, so no @ or
+  + in front of nicks.