Fix some old names that remained

- most in doxygen doc that was never renamed
- some re-introduced in comments/doc/strings by me
diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h
index f0b7b54..9651014 100644
--- a/include/mbedtls/ssl.h
+++ b/include/mbedtls/ssl.h
@@ -1154,7 +1154,7 @@
  * \brief          Set up an SSL context for use
  *
  * \note           No copy of the configuration context is made, it can be
- *                 shared by many ssl_context structures.
+ *                 shared by many mbedtls_ssl_context structures.
  *
  * \warning        Modifying the conf structure after is has been used in this
  *                 function is unsupported!