Update spec.bs

Some cleanups - more likely to follow.

spec.bs

@@ -449,7 +449,7 @@ To <dfn>build an interest group permissions url</dfn> given a [=origin=] |ownerO
 
 <h2 id="leaving-interest-groups">Leaving Interest Groups</h2>
 
-<h3 id="leaveadinterestgroup">leaveAdInterestGroup</h3>
+<h3 id="leaveadinterestgroup">leaveAdInterestGroup()</h3>
 {{Window/navigator}}.{{Navigator/leaveAdInterestGroup()}} removes a user from a particular interest
 group.
 
@@ -510,7 +510,7 @@ are:
 
 </div>
 
-<h3 id="clearoriginjoinedAdInterestGroups">clearOriginJoinedAdInterestGroups</h3>
+<h3 id="clearoriginjoinedAdInterestGroups">clearOriginJoinedAdInterestGroups()</h3>
 {{Window/navigator}}.{{Navigator/clearOriginJoinedAdInterestGroups()}} removes a user from
 [=interest groups=] with the current page's [=interest group/joining origin=].
 
@@ -537,16 +537,16 @@ are:
   "{{NotAllowedError}}" {{DOMException}}.
 
   Note: both joining and leaving interest groups use the "join-ad-interest-group" feature.
-1. Let |owner| be the result of [=parsing an https origin=] with |owner|.
-1. If |owner| is failure, [=exception/throw=] a {{TypeError}}.
+1. Let |ownerOrigin| be the result of [=parsing an https origin=] with |owner|.
+1. If |ownerOrigin| is failure, [=exception/throw=] a {{TypeError}}.
 1. Run these steps [=in parallel=]:
   1. Let |permission| be the result of [=checking interest group permissions=] with
-    |owner|, |frameOrigin|, and "`leave`".
+    |ownerOrigin|, |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.
   1. [=Queue a task=] to [=resolve=] |p| with `undefined`.
   1. [=list/Remove=] [=interest groups=] from the user agent's [=interest group set=] whose
-    [=interest group/owner=] is |owner|,  [=interest group/joining origin=] is [=this=]'s
+    [=interest group/owner=] is |ownerOrigin|,  [=interest group/joining origin=] is [=this=]'s
     [=relevant settings object=]'s [=environment/top-level origin=], and
     [=interest group/name=] is not in |interestGroupsToKeep|.
 1. Return |p|.