doc: add package-level doc comments (#9)

internal/gen/doc.go

@@ -0,0 +1,2 @@
+// Package gen provides code generators based on the instruction database.
+package gen

internal/inst/doc.go

@@ -0,0 +1,2 @@
+// Package inst is the avo instruction database.
+package inst

internal/load/doc.go

@@ -0,0 +1,2 @@
+// Package load loads the instruction database from external sources.
+package load

internal/opcodescsv/doc.go

@@ -0,0 +1,2 @@
+// Package opcodescsv extracts data from the Go x86.csv database.
+package opcodescsv

internal/opcodesxml/opcodesxml.go

@@ -1,3 +1,4 @@
+// Package opcodesxml is a reader for the Opcodes XML database.
 package opcodesxml
 
 import (

internal/prnt/printer.go

@@ -1,3 +1,4 @@
+// Package prnt provides common functionality for code generators.
 package prnt
 
 import (

internal/stack/stack.go

@@ -1,3 +1,4 @@
+// Package stack provides helpers for querying the callstack.
 package stack
 
 import (

internal/test/utils.go

@@ -1,3 +1,4 @@
+// Package test provides testing utilities.
 package test
 
 import (