Fix doxygen error for MBEDTLS_PLATFORM_ZEROIZE_ALT
#define MBEDTLS_TLS_DEFAULT_ALLOW_SHA1_IN_KEY_EXCHANGE
/**
- * \def MBEDTLS_PLATFORM_ZEROIZE_ALT
- *
* Uncomment the macro to let mbed TLS use your alternate implementation of
* mbedtls_platform_zeroize(). This replaces the default implementation in
* platform_util.c.
