f add docs noting that we limit peer counts

Author: TheBlueMatt

lightning/src/ln/channelmanager.rs

@@ -574,6 +574,14 @@ pub type SimpleRefChannelManager<'a, 'b, 'c, 'd, 'e, 'f, 'g, 'h, M, T, F, L> = C
 /// offline for a full minute. In order to track this, you must call
 /// timer_tick_occurred roughly once per minute, though it doesn't have to be perfect.
 ///
+/// ChannelManager limits the number of inbound connections and inbound channels which have not yet
+/// had their funding transaction confirmed. This may result in nodes which we do not have a
+/// channel with being unable to connect to us or open new channels with us if we have many peers
+/// with unfunded channels.
+///
+/// Because it is an indication of trust, inbound channels which we've accepted as 0conf are
+/// exempted from the count of unfunded channels.
+///
 /// Rather than using a plain ChannelManager, it is preferable to use either a SimpleArcChannelManager
 /// a SimpleRefChannelManager, for conciseness. See their documentation for more details, but
 /// essentially you should default to using a SimpleRefChannelManager, and use a