docs: document packages and fix typo

addrmgr/doc.go

@@ -10,7 +10,7 @@ Address Manager Overview
 
 In order maintain the peer-to-peer Decred network, there needs to be a source
 of addresses to connect to as nodes come and go.  The Decred protocol provides
-a the getaddr and addr messages to allow peers to communicate known addresses
+the getaddr and addr messages to allow peers to communicate known addresses
 with each other.  However, there needs to a mechanism to store those results and
 select peers from them.  It is also important to note that remote peers can't
 be trusted to send valid peers nor attempt to provide you with only peers they

bloom/doc.go

@@ -0,0 +1,8 @@
+// Copyright (c) 2018 The Decred developers
+// Use of this source code is governed by an ISC
+// license that can be found in the LICENSE file.
+
+/*
+Package bloom provides an API for dealing with decred-specific bloom filters.
+*/
+package bloom

limits/doc.go

@@ -0,0 +1,8 @@
+// Copyright (c) 2018 The Decred developers
+// Use of this source code is governed by an ISC
+// license that can be found in the LICENSE file.
+
+/*
+Package limits allows to raises some process limits.
+*/
+package limits

mempool/doc.go

@@ -0,0 +1,8 @@
+// Copyright (c) 2018 The Decred developers
+// Use of this source code is governed by an ISC
+// license that can be found in the LICENSE file.
+
+/*
+Package mempool implements a memory pool to store (unconfirmed) transactions.
+*/
+package mempool