Clarify a slightly-ambiguous Otherwise. (#672)

* Normalize line endings.

* Clarify a slightly-ambiguous Otherwise.

spec.bs

@@ -262,7 +262,7 @@ This is detectable because it can change the set of fields that are read from th
 1. Let |p| be [=a new promise=].
 1. Let |queue| be the result of [=starting a new parallel queue=].
 1. [=parallel queue/enqueue steps|Enqueue the following steps=] to |queue|:
-  1. Let |permission| be the result of [=checking interest group permissions=] with 
+  1. Let |permission| be the result of [=checking interest group permissions=] with
     |interestGroup|'s [=interest group/owner=], |frameOrigin|, and "`join`".
   1. If |permission| is false, then [=queue a task=] to [=reject=] |p| with a
      "{{NotAllowedError}}" {{DOMException}} and do not run the remaining steps.
@@ -438,7 +438,7 @@ are:
   1. If |owner| is failure, [=exception/throw=] a {{TypeError}}.
   1. Let |name| be |group|["{{AuctionAdInterestGroupKey/name}}"].
   1. Run these steps [=in parallel=]:
-    1. Let |permission| be the result of [=checking interest group permissions=] with 
+    1. Let |permission| be the result of [=checking interest group permissions=] with
       |owner|, |frameOrigin|, and "`leave`".
     1. If |permission| is false, then [=queue a task=] to [=reject=] |p| with a
        "{{NotAllowedError}}" {{DOMException}} and do not run the remaining steps.
@@ -1020,7 +1020,7 @@ To <dfn>parse an origin</dfn> given a [=string=] |input|:
       the time set to the current UTC day and a count of 1.
     1. [=list/Replace=] the [=interest group=] that has |loadedIg|'s [=interest group/owner=] and
       [=interest group/name=] in the browser’s [=interest group set=] with |loadedIg|.
- 
+
 </div>
 
 <div algorithm>
@@ -1040,9 +1040,9 @@ To <dfn>parse an origin</dfn> given a [=string=] |input|:
   1. [=list/Append=] |win| to |loadedIg|'s [=interest group/previous wins=].
   1. [=list/Replace=] the [=interest group=] that has |loadedIg|'s [=interest group/owner=] and
     [=interest group/name=] in the browser’s [=interest group set=] with |loadedIg|.
- 
-</div>  
-  
+
+</div>
+
 <div algorithm>
 
 To <dfn>build bid generators map</dfn> given an [=auction config=] |auctionConfig|:
@@ -1811,8 +1811,8 @@ null |winningComponentConfig|:
       [=leading bid info/component seller=].
     1. If |winner|'s [=generated bid/modified bid=] is not null, [=map/set=]
       |browserSignals|["`bid`"] to it.
-  1. Otherwise, if |winner|'s [=generated bid/modified bid=] is not null, [=map/set=]
-    |browserSignals|["`modifiedBid`"] to it.
+  1. Otherwise (if |leadingBidInfo|'s [=leading bid info/component seller=] is null), if |winner|'s
+    [=generated bid/modified bid=] is not null, [=map/set=] |browserSignals|["`modifiedBid`"] to it.
   1. Set |config| to |leadingBidInfo|'s [=leading bid info/auction config=].
   1. Let |sellerReportingScript| be the result of [=fetching script=] with |config|'s
     [=auction config/decision logic url=].
@@ -2217,7 +2217,7 @@ of the following global objects:
     1. Let |resultJSON| be "null".
     1. If |functionName| is "`reportResult`", then set |resultJSON| to the result of
       [=serializing a JavaScript value to a JSON string=] given |result|.
-    
+
       Note: Consider a return value that can't be converted to JSON a valid result, so if an
       exception was [=exception/thrown=] in the previous step, keep |resultJSON| as "null".
     1. Return « |resultJSON|, |global|'s [=InterestGroupReportingScriptRunnerGlobalScope/report url=],