Changed the e^v clarification in source

Earlier I made the change in the html generated by doxygen rather than the source used to generate the documentation.

glm/exponential.hpp

@@ -35,7 +35,7 @@ namespace glm
 	template<length_t L, typename T, qualifier Q>
 	GLM_FUNC_DECL vec<L, T, Q> pow(vec<L, T, Q> const& base, vec<L, T, Q> const& exponent);
 
-	/// Returns the natural exponentiation of x, i.e., e^x.
+	/// Returns the natural exponentiation of v, i.e., e^v.
 	///
 	/// @param v exp function is defined for input values of v defined in the range (inf-, inf+) in the limit of the type qualifier.
 	/// @tparam L An integer between 1 and 4 included that qualify the dimension of the vector.