helpers: Fix golint issues

helpers/general.go:448:1: comment on exported function DiffStrings should be of the form "DiffStrings ..."
helpers/hugo.go:42:6: exported type HugoVersionString should have comment or be unexported
helpers/hugo.go:48:1: exported method HugoVersion.Version should have comment or be unexported
helpers/hugo.go:56:1: comment on exported method HugoVersionString.Compare should be of the form "Compare ..."
helpers/hugo.go:62:1: comment on exported method HugoVersionString.Eq should be of the form "Eq ..."
helpers/path.go:548:1: comment on exported function OpenFilesForWriting should be of the form "OpenFilesForWriting ..."
helpers/processing_stats.go:24:6: exported type ProcessingStats should have comment or be unexported
helpers/processing_stats.go:55:1: exported function NewProcessingStats should have comment or be unexported
helpers/processing_stats.go:59:1: exported method ProcessingStats.Incr should have comment or be unexported
helpers/processing_stats.go:63:1: exported method ProcessingStats.Add should have comment or be unexported
helpers/processing_stats.go:67:1: exported method ProcessingStats.Table should have comment or be unexported
helpers/processing_stats.go:83:1: exported function ProcessingStatsTable should have comment or be unexported

1 files changed, 6 insertions, 4 deletions

diff --git a/helpers/hugo.go b/helpers/hugo.go
index 4ec340e18..45c261fd0 100644
--- a/helpers/hugo.go
+++ b/helpers/hugo.go
@@ -39,27 +39,29 @@ var (
 	_ compare.Comparer = (*HugoVersionString)(nil)
 )
 
-type HugoVersionString string
-
 func (v HugoVersion) String() string {
 	return hugoVersion(v.Number, v.PatchLevel, v.Suffix)
 }
 
+// Version returns the Hugo version.
 func (v HugoVersion) Version() HugoVersionString {
 	return HugoVersionString(v.String())
 }
 
+// HugoVersionString represents a Hugo version string.
+type HugoVersionString string
+
 func (h HugoVersionString) String() string {
 	return string(h)
 }
 
-// Implements compare.Comparer
+// Compare implements the compare.Comparer interface.
 func (h HugoVersionString) Compare(other interface{}) int {
 	v := MustParseHugoVersion(h.String())
 	return compareVersionsWithSuffix(v.Number, v.PatchLevel, v.Suffix, other)
 }
 
-// Implements compare.Eqer
+// Eq implements the compare.Eqer interface.
 func (h HugoVersionString) Eq(other interface{}) bool {
 	s, err := cast.ToStringE(other)
 	if err != nil {