add link to pinning PR

src/user/announcements.rst

@@ -18,8 +18,10 @@ This means that the default toolchain (== C++ compiler, linker, standard
 libraries, and related utilities) of that VS version - vc141 - is getting less
 and less use in upstream libraries (because public hosted CI doesn't use it
 anymore by default), and therefore support for it is bitrotting
-at an accelerating pace. We are therefore planning to move our toolchain on
-windows to vc142 (the default in VS2019) in two weeks, on 2022-08-25.
+at an accelerating pace. We are therefore
+`planning <https://github.com/conda-forge/conda-forge-pinning-feedstock/pull/3167>`_
+to move our toolchain on windows to vc142 (the default in VS2019) in two weeks,
+on 2022-08-25.
 
 This will not affect you as a general user of conda-forge packages on windows;
 the only impact is that if you are locally compiling against artefacts produced