Modify ChangeLog according to API changes
diff --git a/ChangeLog b/ChangeLog
index 18273fb..5b8f5e8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -4,13 +4,11 @@
 
 Features
    * Add the functions mbedtls_platform_setup() and mbedtls_platform_teardown()
-     to perform platform-specific setup and teardown operations. Furthermore,
-     the internal functions mbedtls_internal_platform_setup() and
-     mbedtls_internal_platform_teardown() to allow platform-specific hooks to
-     be plugged into the library. Finally, the macro MBEDTLS_PLATFORM_SETUP_ALT
-     allows the internal functions to be overridden. This new APIs are
-     specially useful in some embedded environments that have hardware
-     acceleration support.
+     and the context struct mbedtls_platform_context to perform
+     platform-specific setup and teardown operations. The macro
+     MBEDTLS_PLATFORM_SETUP_ALT allows the functions to be overridden by the
+     user in a platform_alt.h file. This new APIs are specially useful in some
+     embedded environments that have hardware acceleration support.
 
 API Changes
    * Reverted API/ABI breaking changes introduced in mbed TLS 2.5.1, to make the