Allow allowed ranks to be a range

index.bs

@@ -1278,7 +1278,7 @@ Since the {{MLOperand/[[builder]]}} object is bound by the {{MLGraphBuilder/cons
 
 If an operation supports only a subset of {{MLOperandDataType}}s, the <dfn>allowed data types</dfn> for each of the operation's input operands, including both positional arguments and options, are given as either an explicit list of {{MLOperandDataType}}s, or a constraint that the operand's [=MLOperand/dataType=] must be the <dfn lt="same as">same type as</dfn> the [=MLOperand/dataType=] of another input operand, or <dfn lt="any data type">any</dfn> to allow any {{MLOperandDataType}}.
 
-If an operation requires input operands with a particular [=MLOperand/rank=], the <dfn>allowed ranks</dfn> for each of the operation's input operands, including both positional arguments and options, are given as an explicit rank (e.g. 1), or <dfn lt="any rank">N</dfn> to allow any dimensionality.
+If an operation requires input operands with a particular [=MLOperand/rank=], the <dfn>allowed ranks</dfn> for each of the operation's input operands, including both positional arguments and options, are given as an explicit rank (e.g. 1), or <dfn lt="any rank">N</dfn> to allow any dimensionality. More specific constraints are common, such as when an input operand's shape must be [=/unidirectionally broadcastable=] to or [=/bidirectionally broadcastable=] with another input operand; in these cases, the [=/allowed ranks=] are listed as a range, with specific validation given as steps in the operation.
 
 {{MLOperatorOptions}} has the following members:
 <dl dfn-type=dict-member dfn-for=MLOperatorOptions>
@@ -3622,7 +3622,7 @@ partial dictionary MLOpSupportLimits {
   <tr>
     <td>{{MLGemmOptions/c}}</td>
     <td>[=/same as=] {{a}}</td>
-    <td>[=/any rank|N=]</td>
+    <td>0 to 2</td>
   </tr>
 </table>
 
@@ -4702,12 +4702,12 @@ partial dictionary MLOpSupportLimits {
   <tr>
     <td>{{MLLayerNormalizationOptions/scale}}</td>
     <td>[=/same as=] {{input}}</td>
-    <td>[=/any rank|N=]</td>
+    <td>0 to {{input}}'s [=MLOperand/rank=]</td>
   </tr>
   <tr>
     <td>{{MLLayerNormalizationOptions/bias}}</td>
     <td>[=/same as=] {{input}}</td>
-    <td>[=/any rank|N=]</td>
+    <td>0 to {{input}}'s [=MLOperand/rank=]</td>
   </tr>
 </table>
 
@@ -6198,7 +6198,7 @@ partial dictionary MLOpSupportLimits {
   <tr>
     <td>{{slope}}</td>
     <td>[=/same as=] {{input}}</td>
-    <td>[=/any rank|N=]</td>
+    <td>0 to {{input}}'s [=MLOperand/rank=]</td>
   </tr>
 </table>