doc: mention BoolVector and its GLSL alternatives in the type overview.

Not sure why it was missing.

doc/types.dox

@@ -68,7 +68,8 @@ underlying type.
 
 | Magnum vector type                             | Equivalent GLSL type      |
 | ---------------------------------------------- | ------------------------- |
-| @ref Vector2, @ref Vector3, @ref Color3 @ref Vector4, @ref Color4 | @glsl vec2 @ce, @glsl vec3 @ce, @glsl vec4 @ce |
+| @ref Math::BoolVector "Math::BoolVector<2>", @ref Math::BoolVector "Math::BoolVector<3>", @ref Math::BoolVector "Math::BoolVector<4>" | @glsl bvec2 @ce, @glsl bvec3 @ce, @glsl bvec4 @ce |
+| @ref Vector2, @ref Vector3, @ref Color3, @ref Vector4, @ref Color4 | @glsl vec2 @ce, @glsl vec3 @ce, @glsl vec4 @ce |
 | @ref Vector2ui, @ref Vector3ui, @ref Vector4ui | @glsl uvec2 @ce, @glsl uvec3 @ce, @glsl uvec4 @ce |
 | @ref Vector2i, @ref Vector3i, @ref Vector4i    | @glsl ivec2 @ce, @glsl ivec3 @ce, @glsl ivec4 @ce |
 | @ref Vector2d, @ref Vector3d, @ref Vector4d    | @glsl dvec2 @ce, @glsl dvec3 @ce, @glsl dvec4 @ce |