Fixed API documentation reference

glm/vector_relational.hpp

@@ -1,5 +1,5 @@
 /// @ref core
-/// @file glm/detail/func_vector_relational.hpp
+/// @file glm/vector_relational.hpp
 ///
 /// @see <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.7 Vector Relational Functions</a>
 ///