doc: avoid referencing the deprecated Math::swizzle() function.

doc/changelog-old.dox

@@ -422,7 +422,7 @@ for a high-level overview.
     -   Removed deprecated @cpp Matrix2 @ce and @cpp Matrix2d @ce typedefs, use
         @ref Matrix2x2 and @ref Matrix2x2d instead
     -   Removed deprecated `Magnum/Swizzle.h` header and @cpp Magnum::swizzle() @ce
-        function, use @ref Magnum/Math/Swizzle.h and @ref Math::swizzle()
+        function, use @ref Magnum/Math/Swizzle.h and @cpp Math::swizzle() @ce
         instead
     -   Removed deprecated @cpp *::maxSupported*() @ce limit queries, use the
         less verbose @cpp *::max*() @ce versions instead
@@ -708,7 +708,7 @@ for a high-level overview.
 -   @cpp Matrix2 @ce and @cpp Matrix2d @ce is deprecated, use @ref Matrix2x2
     and @ref Matrix2x2d instead
 -   @cpp swizzle() @ce is deprecated, all of its functionality has been moved
-    into @ref Math::swizzle()
+    into @cpp Math::swizzle() @ce
 -   @cpp Buffer::setData() @ce and @cpp Buffer::setSubData() @ce overloads
     taking pair of data pointer and size are deprecated, use
     @cpp Containers::ArrayReference @ce-based @cpp Buffer::setData() @ce and

src/Magnum/GL/Texture.h

@@ -601,7 +601,7 @@ template<UnsignedInt dimensions> class Texture: public AbstractTexture {
          * You can use letters @cpp 'r' @ce, @cpp 'g' @ce, @cpp 'b' @ce,
          * @cpp 'a' @ce for addressing components or letters @cpp '0' @ce and
          * @cpp '1' @ce for zero and one, similarly as in the
-         * @ref Math::swizzle() function. Example usage:
+         * @ref Math::gather() function. Example usage:
          *
          * @snippet MagnumGL.cpp Texture-setSwizzle
          *

src/Magnum/Math/Vector3.h

@@ -223,7 +223,7 @@ template<class T> class Vector3: public Vector<3, T> {
          * @brief XY part of the vector
          * @return First two components of the vector
          *
-         * @see @ref swizzle()
+         * @see @ref gather(), @ref scatter()
          */
         Vector2<T>& xy() { return Vector2<T>::from(Vector<3, T>::data()); }
         constexpr const Vector2<T> xy() const {

src/Magnum/Math/Vector4.h

@@ -182,7 +182,7 @@ template<class T> class Vector4: public Vector<4, T> {
          * @brief XYZ part of the vector
          * @return First three components of the vector
          *
-         * @see @ref swizzle(), @ref rgb()
+         * @see @ref rgb(), @ref gather(), @ref scatter()
          */
         Vector3<T>& xyz() { return Vector3<T>::from(Vector<4, T>::data()); }
         constexpr const Vector3<T> xyz() const {
@@ -194,7 +194,7 @@ template<class T> class Vector4: public Vector<4, T> {
          * @return First three components of the vector
          *
          * Equivalent to @ref xyz().
-         * @see @ref swizzle()
+         * @see @ref gather(), @ref scatter()
          */
         Vector3<T>& rgb() { return Vector3<T>::from(Vector<4, T>::data()); }
         constexpr const Vector3<T> rgb() const {
@@ -205,7 +205,7 @@ template<class T> class Vector4: public Vector<4, T> {
          * @brief XY part of the vector
          * @return First two components of the vector
          *
-         * @see @ref swizzle()
+         * @see @ref gather(), @ref scatter()
          */
         Vector2<T>& xy() { return Vector2<T>::from(Vector<4, T>::data()); }
         constexpr const Vector2<T> xy() const {