ext: misc doc comment fixes

ext/imagefmt/aci/aci.go

@@ -12,6 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// Package aci implements an imagefmt.Extractor for appc formatted container
+// image layers.
 package aci
 
 import (

ext/imagefmt/docker/docker.go

@@ -12,6 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// Package docker implements an imagefmt.Extractor for docker formatted
+// container image layers.
 package docker
 
 import (

ext/imagefmt/driver.go

@@ -51,7 +51,7 @@ type Extractor interface {
 	ExtractFiles(layer io.ReadCloser, filenames []string) (tarutil.FilesMap, error)
 }
 
-// RegisterExtractor makes a extractor available by the provided name.
+// RegisterExtractor makes an extractor available by the provided name.
 //
 // If called twice with the same name, the name is blank, or if the provided
 // Extractor is nil, this function panics.
@@ -60,11 +60,11 @@ func RegisterExtractor(name string, d Extractor) {
 	defer extractorsM.Unlock()
 
 	if name == "" {
-		panic("imagefmt: could not register a extractor with an empty name")
+		panic("imagefmt: could not register an Extractor with an empty name")
 	}
 
 	if d == nil {
-		panic("imagefmt: could not register a nil extractor")
+		panic("imagefmt: could not register a nil Extractor")
 	}
 
 	// Enforce lowercase names, so that they can be reliably be found in a map.

ext/versionfmt/dpkg/parser.go

@@ -1,4 +1,4 @@
-// Copyright 2016 clair authors
+// Copyright 2017 clair authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -12,6 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// Package dpkg implements a versionfmt.Parser for version numbers used in dpkg
+// based software packages.
 package dpkg
 
 import (

ext/versionfmt/rpm/parser.go

@@ -1,4 +1,4 @@
-// Copyright 2016 clair authors
+// Copyright 2017 clair authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -12,6 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// Package rpm implements a versionfmt.Parser for version numbers used in rpm
+// based software packages.
 package rpm
 
 import (