Stylistic change: Fix indentation of steps validating bias option

Validation of the passed bias option only makes sense if the option is
actually supplied. Correct the indentation for a few substeps.

index.bs

@@ -2152,8 +2152,8 @@ partial interface MLGraphBuilder {
     1. Else if |inputSize| % |options|.{{MLConv2dOptions/groups}} is not 0, then [=exception/throw=] a "{{DataError}}" {{DOMException}}.
     1. If |options|.{{MLConv2dOptions/bias}} [=map/exists=]:
         1. [=Assert=]: the type of |options|.{{MLConv2dOptions/bias}} is {{MLOperand}}.
-    1. If the [=list/size=] of |options|.{{MLConv2dOptions/bias}}.{{MLOperand/[[descriptor]]}}.{{MLOperandDescriptor/dimensions}} is not 1, then [=exception/throw=] a {{TypeError}}.
-    1. If |options|.{{MLConv2dOptions/bias}}.{{MLOperand/[[descriptor]]}}.{{MLOperandDescriptor/dataType}} is not the same as |input|.{{MLOperand/[[descriptor]]}}.{{MLOperandDescriptor/dataType}}, then [=exception/throw=] a {{TypeError}}.
+        1. If the [=list/size=] of |options|.{{MLConv2dOptions/bias}}.{{MLOperand/[[descriptor]]}}.{{MLOperandDescriptor/dimensions}} is not 1, then [=exception/throw=] a {{TypeError}}.
+        1. If |options|.{{MLConv2dOptions/bias}}.{{MLOperand/[[descriptor]]}}.{{MLOperandDescriptor/dataType}} is not the same as |input|.{{MLOperand/[[descriptor]]}}.{{MLOperandDescriptor/dataType}}, then [=exception/throw=] a {{TypeError}}.
     1. If |options|.{{MLConv2dOptions/activation}} [=map/exists=]:
         1. [=Assert=]: the type of |options|.{{MLConv2dOptions/activation}} is {{MLActivation}}.
     1. Let |outputShape| be the result of invoking the underlying implementation for calculating output dimensions, given |options|.
@@ -2331,8 +2331,8 @@ partial interface MLGraphBuilder {
     1. Else if |inputSize| % |options|.{{MLConvTranspose2dOptions/groups}} is not 0, then [=exception/throw=] a "{{DataError}}" {{DOMException}}.
     1. If |options|.{{MLConvTranspose2dOptions/bias}} [=map/exists=]:
         1. [=Assert=]: the type of |options|.{{MLConvTranspose2dOptions/bias}} is {{MLOperand}}.
-    1. If the [=list/size=] of |options|.{{MLConvTranspose2dOptions/bias}}.{{MLOperand/[[descriptor]]}}.{{MLOperandDescriptor/dimensions}} is not 1, then [=exception/throw=] a {{TypeError}}.
-    1. If |options|.{{MLConvTranspose2dOptions/bias}}.{{MLOperand/[[descriptor]]}}.{{MLOperandDescriptor/dataType}} is not the same as |input|.{{MLOperand/[[descriptor]]}}.{{MLOperandDescriptor/dataType}}, then [=exception/throw=] a {{TypeError}}.
+        1. If the [=list/size=] of |options|.{{MLConvTranspose2dOptions/bias}}.{{MLOperand/[[descriptor]]}}.{{MLOperandDescriptor/dimensions}} is not 1, then [=exception/throw=] a {{TypeError}}.
+        1. If |options|.{{MLConvTranspose2dOptions/bias}}.{{MLOperand/[[descriptor]]}}.{{MLOperandDescriptor/dataType}} is not the same as |input|.{{MLOperand/[[descriptor]]}}.{{MLOperandDescriptor/dataType}}, then [=exception/throw=] a {{TypeError}}.
     1. If |options|.{{MLConvTranspose2dOptions/activation}} [=map/exists=]:
         1. [=Assert=]: the type of |options|.{{MLConvTranspose2dOptions/activation}} is {{MLActivation}}.
     1. Let |outputShape| be the result of invoking the underlying implementation for calculating output dimensions, given |options|.