internal/gen: doc exported symbols (#9)

internal/gen/build.go

@@ -11,6 +11,10 @@ type build struct {
 	prnt.Generator
 }
 
+// NewBuild builds a printer that will generate instruction functions in the
+// build package. Each instruction will have one method on the build.Context
+// type, and a corresponding wrapper operating on the global Context. These
+// functions are thin wrappers around constructors generated by NewCtors.
 func NewBuild(cfg printer.Config) Interface {
 	return GoFmt(&build{cfg: cfg})
 }