rename three_half_pi() => three_over_two_pi()

glm/gtc/constants.hpp

@@ -89,7 +89,7 @@ namespace glm
 	/// Return pi / 2 * 3.
 	/// @see gtc_constants
 	template <typename genType>
-	GLM_FUNC_DECL genType three_half_pi();
+	GLM_FUNC_DECL genType three_over_two_pi();
 
 	/// Return pi / 4.
 	/// @see gtc_constants

glm/gtc/constants.inl

@@ -73,7 +73,7 @@ namespace glm
 	}
 
 	template <typename genType>
-	GLM_FUNC_QUALIFIER genType three_half_pi()
+	GLM_FUNC_QUALIFIER genType three_over_two_pi()
 	{
 		return genType(4.71238898038468985769396507491925432);           
 	}