Fix a fairly common typo in comments
diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h
index 2d7beb3..d23b1be 100644
--- a/include/mbedtls/ssl.h
+++ b/include/mbedtls/ssl.h
@@ -840,7 +840,7 @@
 
 /**
  * \brief          Initialize an SSL context
- *                 Just makes the context ready for mbetls_ssl_setup() or
+ *                 Just makes the context ready for mbedtls_ssl_setup() or
  *                 mbedtls_ssl_free()
  *
  * \param ssl      SSL context