Clarify changelog

Remove mention of the shipped .sln files, as those are planned to be
removed from Mbed TLS.

Clarify the affected CRT headers.

Signed-off-by: Bence Szépkúti <bence.szepkuti@arm.com>
diff --git a/ChangeLog.d/fix-msvc-version-guard-format-zu.txt b/ChangeLog.d/fix-msvc-version-guard-format-zu.txt
index e61cd7d..2713f6c 100644
--- a/ChangeLog.d/fix-msvc-version-guard-format-zu.txt
+++ b/ChangeLog.d/fix-msvc-version-guard-format-zu.txt
@@ -4,5 +4,6 @@
      with Visual Studio 2013 or MinGW.
      Fixes #10017.
    * Remove Everest Visual Studio 2010 compatibility headers, which could
-     interfere with standard CRT headers in certain situations, eg. when
-     building Mbed TLS with the .sln file shipped with the project.
+     shadow standard CRT headers inttypes.h and stdbool.h with incomplete
+     implementatios if placed on the include path, eg. when building Mbed TLS
+     with the .sln file shipped with the project.