Update ConvInteger operator kernel docs for int8 support

Author: rivkastroh

docs/OperatorKernels.md

@@ -88,7 +88,7 @@ Do not modify directly.*
 |Conv|*in* X:**T**<br> *in* W:**T**<br> *in* B:**T**<br> *out* Y:**T**|22+|**T** = tensor(float)|
 |||[11, 21]|**T** = tensor(float)|
 |||[1, 10]|**T** = tensor(float)|
-|ConvInteger|*in* x:**T1**<br> *in* w:**T2**<br> *in* x_zero_point:**T1**<br> *in* w_zero_point:**T2**<br> *out* y:**T3**|10+|**T1** = tensor(uint8)<br/> **T2** = tensor(uint8)<br/> **T3** = tensor(int32)|
+|ConvInteger|*in* x:**T1**<br> *in* w:**T2**<br> *in* x_zero_point:**T1**<br> *in* w_zero_point:**T2**<br> *out* y:**T3**|10+|**T1** = tensor(int8), tensor(uint8)<br/> **T2** = tensor(int8), tensor(uint8)<br/> **T3** = tensor(int32)|
 |ConvTranspose|*in* X:**T**<br> *in* W:**T**<br> *in* B:**T**<br> *out* Y:**T**|22+|**T** = tensor(float)|
 |||[11, 21]|**T** = tensor(float)|
 |||[1, 10]|**T** = tensor(float)|