ChangeLog.d: Reworded updated_windows_apis.txt.

Signed-off-by: Minos Galanakis <minos.galanakis@arm.com>
diff --git a/ChangeLog.d/updated_windows_apis.txt b/ChangeLog.d/updated_windows_apis.txt
index 8df2297..8a70958 100644
--- a/ChangeLog.d/updated_windows_apis.txt
+++ b/ChangeLog.d/updated_windows_apis.txt
@@ -1,5 +1,5 @@
-API changes
+Requirement changes
    * Update Windows APIs to use BCryptGenRandom and wcslen and
-   ensure that conversions between size_t, ULONG, and int are
-   always done safely. Original contribution by Kevin Kane #635,
-   #730 followed by #Simon Butcher #1453.
+     ensure that conversions between size_t, ULONG, and int are
+     always done safely. Original contribution by Kevin Kane #635,
+     #730 followed by Simon Butcher #1453.