doc: update changelog.

doc/changelog.dox

@@ -942,7 +942,8 @@ See also:
     enforced anymore. See [mosra/magnum#617](https://github.com/mosra/magnum/pull/617).
 -   The Emscripten toolchain now prefers include directory located in the
     Emscripten cache, which as of Emscripten 3.0.4 contains the `version.h`
-    header. See also @ref platforms-html6-troubleshooting-including-files-from-emscripten-tree-not-supported
+    header. See [mosra/corrade#133](https://github.com/mosra/corrade/issues/133)
+    and also @ref platforms-html6-troubleshooting-including-files-from-emscripten-tree-not-supported
     for troubleshooting info.
 -   The Emscripten toolchain now uses the `-flto` flag instead of `--llvm-lto`,
     which was specific to the fastcomp backend that's removed as of Emscripten