Fix grammar in docs for MBEDTLS_HAVE_TIME_DATE
* Comment if your system does not have a correct clock.
*
* \note mbedtls_platform_gmtime() is an abstraction in platform_util.h that
- * when called behaves similar to the gmtime() function from the C standard,
+ * when called behaves similarly to the gmtime() function from the C standard,
* but is thread safe. Mbed TLS will try to identify the underlying platform
* and configure an appropriate underlying implementation (e.g. gmtime_r() for
* POSIX and gmtime_s() for Windows). If this is not possible, then gmtime()
