Add location, venue and user profile photos type documentation

types.go

@@ -613,21 +613,30 @@ type Contact struct {
 
 // Location contains information about a place.
 type Location struct {
+	// Longitude as defined by sender
 	Longitude float64 `json:"longitude"`
+	// Latitude as defined by sender
 	Latitude float64 `json:"latitude"`
 }
 
 // Venue contains information about a venue, including its Location.
 type Venue struct {
+	// Location venue location
 	Location Location `json:"location"`
+	// Title name of the venue
 	Title string `json:"title"`
+	// Address of the venue
 	Address string `json:"address"`
-	FoursquareID string   `json:"foursquare_id"` // optional
+	// FoursquareID foursquare identifier of the venue
+	// optional
+	FoursquareID string `json:"foursquare_id"`
 }
 
 // UserProfilePhotos contains a set of user profile photos.
 type UserProfilePhotos struct {
+	// TotalCount total number of profile pictures the target user has
 	TotalCount int `json:"total_count"`
+	// Photos requested profile pictures (in up to 4 sizes each)
 	Photos [][]PhotoSize `json:"photos"`
 }