doc: updated credits and changelog.

doc/changelog.dox

@@ -283,7 +283,7 @@ See also:
         device-level properties
     -   @ref Vk::Instance and @ref Vk::Device APIs for instance and device
         creation and fetching instance/device-specific function pointers,
-        @ref Vk::Queue setup
+        @ref Vk::Queue setup. See also [mosra/magnum#549](https://github.com/mosra/magnum/pull/549).
     -   @ref Vk::CommandPool and @ref Vk::CommandBuffer wrappers
     -   Initial implementations of @ref Vk::Memory, @ref Vk::Buffer and
         @ref Vk::Image

doc/credits.dox

@@ -200,6 +200,8 @@ Are the below lists missing your name or something's wrong?
     and GLES fixes
 -   **Samuel Kogler** ([\@skogler](https://github.com/skogler)) ---
     @ref Platform::GlfwApplication crash fixes
+-   **Samuel Vargas** ([\@Samulus](https://github.com/Samulus)) --- fixes in
+    the @ref Vk library
 -   **[\@Selot](https://github.com/Selot)** --- Fixes in the `base-qt`
     bootstrap project
 -   **Séverin Lemaignan** ([\@severin-lemaignan](https://github.com/severin-lemaignan))