Bump version to Mbed TLS 2.7.16

Executed "./scripts/bump_version.sh --version 2.7.16"

Signed-off-by: Janos Follath <janos.follath@arm.com>
diff --git a/doxygen/input/doc_mainpage.h b/doxygen/input/doc_mainpage.h
index 9a27286..39b6ffa 100644
--- a/doxygen/input/doc_mainpage.h
+++ b/doxygen/input/doc_mainpage.h
@@ -51,7 +51,7 @@
  */
 
 /**
- * @mainpage mbed TLS v2.7.15 source code documentation
+ * @mainpage mbed TLS v2.7.16 source code documentation
  *
  * This documentation describes the internal structure of mbed TLS.  It was
  * automatically generated from specially formatted comment blocks in