Adapt ChangeLog

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
diff --git a/ChangeLog.d/doc-x509-profile-pk.txt b/ChangeLog.d/doc-x509-profile-pk.txt
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+Bugfix
+   * Fix incorrect documentation of mbedtls_x509_crt_profile. The previous
+     documentation stated that the `allowed_pks` field applies to signatures
+     only, but in fact it does apply to the public key type of the end entity
+     certificate, too. Fixes #1992.