Improvements to the top of the code style config

Signed-off-by: David Horstmann <[email protected]>

.uncrustify.cfg

@@ -1,3 +1,8 @@
+# Configuration options for Uncrustify specifying the Mbed TLS code style.
+#
+# Note: The code style represented by this file has not yet been introduced
+# to Mbed TLS.
+#
 # Copyright The Mbed TLS Contributors
 # SPDX-License-Identifier: Apache-2.0
 #
@@ -13,7 +18,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# Configuration options for Mbed TLS code style
 
 # Line length options