Rename to mbed TLS in the documentation/comments
diff --git a/library/md.c b/library/md.c
index 202ce58..e97aafb 100644
--- a/library/md.c
+++ b/library/md.c
@@ -1,7 +1,7 @@
 /**
  * \file md.c
  *
- * \brief Generic message digest wrapper for PolarSSL
+ * \brief Generic message digest wrapper for mbed TLS
  *
  * \author Adriaan de Jong <dejong@fox-it.com>
  *