Update index.bs

Co-authored-by: Ningxin Hu <[email protected]>

index.bs

@@ -6608,7 +6608,7 @@ partial dictionary MLOpSupportLimits {
     1. If |allowedDataTypes| is given and it does not [=list/contain=] |input|'s [=MLOperand/dataType=], then [=exception/throw=] a {{TypeError}}.
     1. If |input|'s [=MLOperand/rank=] is not 4, then [=exception/throw=] a {{TypeError}}.
     1. If |options|.{{MLPool2dOptions/windowDimensions}} does not [=map/exist=], set |options|.{{MLPool2dOptions/windowDimensions}} to the height and width dimensions of the shape of |input|.
-    1. If |options|.{{MLPool2dOptions/windowDimensions}}'s not 2, then [=exception/throw=] a {{TypeError}}.
+    1. If |options|.{{MLPool2dOptions/windowDimensions}}'s [=list/size=] is not 2, then [=exception/throw=] a {{TypeError}}.
     1. If |options|.{{MLPool2dOptions/outputSizes}} [=map/exists=], or if |options|.{{MLPool2dOptions/padding}} does not [=map/exist=], set |options|.{{MLPool2dOptions/padding}} to the [=/list=] « 0, 0, 0, 0 ».
     1. If |options|.{{MLPool2dOptions/padding}}'s [=list/size=] is not 4, then [=exception/throw=] a {{TypeError}}.
     1. If |options|.{{MLPool2dOptions/strides}} does not [=map/exist=], set |options|.{{MLPool2dOptions/strides}} to the [=/list=] « 1, 1 ».