docs: improve comments for functions; enable godot (#1382)

lint/formatter.go

@@ -1,13 +1,13 @@
 package lint
 
-// FormatterMetadata configuration of a formatter
+// FormatterMetadata configuration of a formatter.
 type FormatterMetadata struct {
 	Name        string
 	Description string
 	Sample      string
 }
 
-// Formatter defines an interface for failure formatters
+// Formatter defines an interface for failure formatters.
 type Formatter interface {
 	Format(<-chan Failure, Config) (string, error)
 	Name() string