Clarify Validate method functionality in doc comments

geom/type_geometry_collection.go

@@ -38,9 +38,8 @@ func NewGeometryCollection(geoms []Geometry) GeometryCollection {
 	return GeometryCollection{geoms, ctype}
 }
 
-// Validate checks if the GeometryCollection is valid. GeometryCollections are
-// unconstrained collections, however this method additionally checks that each
-// child Geometry is valid.
+// Validate checks if the GeometryCollection is valid. The only validation rule
+// is that each geometry in the collection must be valid.
 func (c GeometryCollection) Validate() error {
 	for i, g := range c.geoms {
 		if err := g.Validate(); err != nil {

geom/type_multi_line_string.go

@@ -42,9 +42,8 @@ func NewMultiLineString(lines []LineString) MultiLineString {
 	return MultiLineString{lines, ctype}
 }
 
-// Validate checks if the MultiLineString is valid. MultiLineStrings are
-// unconstrained collections, however this method additionally checks that each
-// child LineString is valid.
+// Validate checks if the MultiLineString is valid. The only validation rule is
+// that each LineString in the collection must be valid.
 func (m MultiLineString) Validate() error {
 	for i, ls := range m.lines {
 		if err := ls.Validate(); err != nil {

geom/type_multi_point.go

@@ -34,9 +34,8 @@ func NewMultiPoint(pts []Point) MultiPoint {
 	return MultiPoint{forced, ctype}
 }
 
-// Validate checks if the MultiPoint is valid. MultiPoints are unconstrained
-// collections, however this method additionally checks that each child Point
-// is valid.
+// Validate checks if the MultiPoint is valid. The only validation rule is that
+// each point in the collection must be valid.
 func (m MultiPoint) Validate() error {
 	for i, pt := range m.points {
 		if err := pt.Validate(); err != nil {

geom/type_multi_polygon.go

@@ -43,12 +43,10 @@ func NewMultiPolygon(polys []Polygon) MultiPolygon {
 // The Polygons that make up a MultiPolygon are constrained by the following
 // rules:
 //
-//  1. The interiors of any two child polygons must not intersect.
-//  2. The boundaries of any two child polygons may touch only at a finite
+//  1. Each child polygon must be valid.
+//  2. The interiors of any two child polygons must not intersect.
+//  3. The boundaries of any two child polygons may touch only at a finite
 //     number of points.
-//
-// In addition to these constraints, this method also checks if each child
-// Polygon is valid.
 func (m MultiPolygon) Validate() error {
 	for i, poly := range m.polys {
 		if err := poly.Validate(); err != nil {