some updates to documentation

docs/manual.txt

@@ -1,6 +1,12 @@
 
 Instructions for running of the honk.
 
+-- posting
+
+Should work as expected. Supports **bold** and *italics*.
+
+Large images are rescaled and reduced.
+
 -- following
 
 In order to follow somebody, you need to enter one of two identifiers.
@@ -12,6 +18,8 @@ Alternatively, one may directly enter the actor ID, which is a URL that looks
 like https://example.com/users/name. Note that the commonly seen URL with
 @name in it is not their actor ID and won't work.
 
+Followed honkers may be assigned to combos, listing all their honks together.
+
 Selecting just peeping won't actually follow them. (Incomplete feature.)
 
 -- zonking
@@ -21,6 +29,9 @@ those of others that you're tired of seeing. This reduces its visibility, but
 doesn't attempt to delete it, which is infeasible.
 It's more like disavow.
 
+The killzone supports blocking unwanted contacts. One may block an actor
+(zonker), a domain (zurl), or thread (zonvoy).
+
 -- privacy
 
 Honks are public. Welcome to the internet.

docs/spec.txt

@@ -18,6 +18,13 @@ If a message can't be delivered, we backoff and retry.
 
 A random drift of up to 10% is added to each delay to avoid swarming.
 
+-- federating
+
+Messages are transformed for federation and display. Some transformations
+occur send side and some occur receive client because it's more exciting that
+way. @mentions and *markdown* are converted to HTML before transmission.
+Message :emoji: are converted to inline images after receiving.
+
 -- schema
 
 Some notes on the database schema. Mostly for development, but maybe useful