Add some missing doc comments

As pointed out by the linter, some exported functions and types are
missing doc comments.
The linter warnings have been reduced from 194 to 116.
Not all missing comments have been added in this commit though.

1 files changed, 5 insertions, 0 deletions

diff --git a/hugolib/handler_base.go b/hugolib/handler_base.go
index 99c15e15d..10698ea7a 100644
--- a/hugolib/handler_base.go
+++ b/hugolib/handler_base.go
@@ -17,6 +17,7 @@ import (
 	"github.com/gohugoio/hugo/source"
 )
 
+// Handler is used for processing files of a specific type.
 type Handler interface {
 	FileConvert(*source.File, *Site) HandledResult
 	PageConvert(*Page) HandledResult
@@ -24,14 +25,17 @@ type Handler interface {
 	Extensions() []string
 }
 
+// Handle identifies functionality assosiated with certain file extentions.
 type Handle struct {
 	extensions []string
 }
 
+// Extensions returns a list of extentions.
 func (h Handle) Extensions() []string {
 	return h.extensions
 }
 
+// HandledResult describes the results of a file handling operation.
 type HandledResult struct {
 	page *Page
 	file *source.File
@@ -55,6 +59,7 @@ func (h HandledResult) String() string {
 	return h.Error()
 }
 
+// Page returns the affected page.
 func (h HandledResult) Page() *Page {
 	return h.page
 }