fix(helm): fix style issues

This just adds a few comments where the style linter was complaining.

pkg/helm/environment/environment.go

@@ -30,12 +30,17 @@ import (
 )
 
 const (
-	HomeEnvVar          = "HELM_HOME"
-	PluginEnvVar        = "HELM_PLUGIN"
+	// HomeEnvVar is the HELM_HOME environment variable key.
+	HomeEnvVar = "HELM_HOME"
+	// PluginEnvVar is the HELM_PLUGIN environment variable key.
+	PluginEnvVar = "HELM_PLUGIN"
+	// PluginDisableEnvVar is the HELM_NO_PLUGINS environment variable key.
 	PluginDisableEnvVar = "HELM_NO_PLUGINS"
-	HostEnvVar          = "HELM_HOST"
+	// HostEnvVar is the HELM_HOST environment variable key.
+	HostEnvVar = "HELM_HOST"
 )
 
+// DefaultHelmHome gets the configured HELM_HOME, or returns the default.
 func DefaultHelmHome() string {
 	if home := os.Getenv(HomeEnvVar); home != "" {
 		return home
@@ -43,14 +48,21 @@ func DefaultHelmHome() string {
 	return filepath.Join(os.Getenv("HOME"), ".helm")
 }
 
+// DefaultHelmHost returns the configured HELM_HOST or an empty string.
 func DefaultHelmHost() string {
 	return os.Getenv(HostEnvVar)
 }
 
+// EnvSettings describes all of the environment settings.
 type EnvSettings struct {
-	TillerHost      string
+	// TillerHost is the host and port of Tiller.
+	TillerHost string
+	// TillerNamespace is the namespace in which Tiller runs.
 	TillerNamespace string
-	Home            helmpath.Home
-	PlugDirs        string
-	Debug           bool
+	// Home is the local path to the Helm home directory.
+	Home helmpath.Home
+	// PluginDirs is the path to the plugin directories.
+	PlugDirs string
+	// Debug indicates whether or not Helm is running in Debug mode.
+	Debug bool
 }