Math: doc++

Improve related links for the literals, and don't say "calls" because it
doesn't do that anymore, and it'd imply it inherits the same issues with
not checking for hexadecimal colors or not checking length.

src/Magnum/Math/Color.h

@@ -1527,7 +1527,7 @@ RGB. Use this literal to document that given value is in sRGB. Example usage:
     representation directly or convert the value using @ref Color3::fromSrgb()
     / @ref Color3::fromSrgbInt().
 
-@see @link operator""_srgba() @endlink, @link operator""_rgb() @endlink
+@see @link operator""_srgba() @endlink, @link operator""_srgbf() @endlink
 @m_keywords{_srgb srgb}
 */
 /* Output is a Vector3 to hint that it doesn't have any (additive,
@@ -1573,7 +1573,7 @@ usage:
     representation directly or convert the value using
     @ref Color4::fromSrgbAlpha() / @ref Color4::fromSrgbAlphaInt().
 
-@see @link operator""_srgb() @endlink, @link operator""_rgba() @endlink
+@see @link operator""_srgb() @endlink, @link operator""_rgbaf() @endlink
 @m_keywords{_srgba srgba}
 */
 /* Output is a Vector3 to hint that it doesn't have any (additive,
@@ -1605,7 +1605,8 @@ template<char... chars> constexpr Color3<Float> operator"" _rgbf() {
 /** @relatesalso Magnum::Math::Color3
 @brief Float sRGB literal
 
-Calls @ref Color3::fromSrgbInt() on the literal value. Example usage:
+Equivalent to calling @ref Color3::fromSrgbInt() on the literal value. Example
+usage:
 
 @snippet Math.cpp _srgbf
 
@@ -1640,7 +1641,8 @@ template<char... chars> constexpr Color4<Float> operator"" _rgbaf() {
 /** @relatesalso Magnum::Math::Color4
 @brief Float sRGB + alpha literal
 
-Calls @ref Color4::fromSrgbAlphaInt() on the literal value. Example usage:
+Equivalent to calling @ref Color4::fromSrgbAlphaInt() on the literal value.
+Example usage:
 
 @snippet Math.cpp _srgbaf