Update config.h.in

closes https://github.com/assimp/assimp/issues/2570: fix a typo.

include/assimp/config.h.in

@@ -142,7 +142,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 /** @brief  Specifies the maximum angle that may be between two vertex tangents
  *         that their tangents and bi-tangents are smoothed.
  *
- * This applies to the CalcTangentSpace-Step. TFvhe angle is specified
+ * This applies to the CalcTangentSpace-Step. The angle is specified
  * in degrees. The maximum value is 175.
  * Property type: float. Default value: 45 degrees
  */