Structs: fix documentation

field.go

@@ -85,13 +85,14 @@ func (f *Field) Set(val interface{}) error {
 	return nil
 }
 
-// Fields returns a slice of Fields. A struct tag with the content of "-"
-// ignores the checking of that particular field. Example:
+// Fields returns a slice of Fields. This is particular handy to get the fields
+// of a nested struct . A struct tag with the content of "-" ignores the
+// checking of that particular field. Example:
 //
 //   // Field is ignored by this package.
-//   Field bool `structs:"-"`
+//   Field *http.Request `structs:"-"`
 //
-// It panics if s's kind is not struct.
+// It panics if field is not exported or if field's kind is not struct
 func (f *Field) Fields() []*Field {
 	return getFields(f.value)
 }