fix various issues

Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/library/ecdh.c b/library/ecdh.c
index 4d73da0..b72bd1f 100644
--- a/library/ecdh.c
+++ b/library/ecdh.c
@@ -788,7 +788,7 @@
 }
 
 /*
- * Setup context without everst
+ * Setup context without Everest
  */
 int mbedtls_ecdh_setup_no_everest( mbedtls_ecdh_context *ctx,
                                    mbedtls_ecp_group_id grp_id )