Merge pull request #440 from w3c/timg-nits

Nits arising from Tim Geoghegan's review

Author: martinthomson

api.bs

@@ -449,7 +449,7 @@ partial interface Navigator {
 
 This provides three key functions:
 
-* A list of browser-supported aggregation functions ([[#find-aggregation-service]])
+* A list of browser-supported aggregation services ([[#find-aggregation-service]])
 * A means of asking the browser to save impressions ([[#save-impression-api]])
 * A method to request conversion measurement ([[#measure-conversion-api]])
 
@@ -775,7 +775,7 @@ The arguments to <a method for=Attribution>measureConversion()</a> are as follow
   <dt><dfn>lookbackDays</dfn></dt>
   <dd>A positive integer number of days. Only impressions occurring within the past `lookbackDays` may match this [=conversion=]. If omitted, it is equivalent to the [=maximum lookback=].</dd>
   <dt><dfn>matchValues</dfn></dt>
-  <dd>A [=set=] of match values that can be used to select this [=impression=].</dd>
+  <dd>A [=set=] of match values that can be used to select [=impressions=].</dd>
   <dt><dfn>impressionSites</dfn></dt>
   <dd>
     A [=set=] of impression sites.
@@ -792,8 +792,6 @@ The arguments to <a method for=Attribution>measureConversion()</a> are as follow
     only [=impressions=] recorded by one of the listed sites
     are eligible to match this [=conversion=].
   </dd>
-  <dt><dfn>credit</dfn></dt>
-  <dd>A [=list=] of numbers.</dd>
   <dt><dfn>value</dfn></dt>
   <dd>
     The [=conversion value=]. If an attribution is made and [[#dp|privacy]]
@@ -806,6 +804,17 @@ The arguments to <a method for=Attribution>measureConversion()</a> are as follow
     will be added to the outcome. It is also used to determine the amount of [=privacy budget=]
     to expend on this [=conversion report=].
   </dd>
+  <dt><dfn>credit</dfn></dt>
+  <dd>
+    A [=list=] of finite positive numbers
+    that describe how the [=conversion value=] is allocated across multiple impressions.
+    The value is split across the list of selected impressions
+    proportional to the values in the list
+    in the order specified.
+    If fewer impressions are selected than values in this list,
+    any additional items in this list are ignored.
+    When absent, the conversion value is allocated to a single impression.
+  </dd>
 </dl>
 
 
@@ -2741,8 +2750,8 @@ The <a enum-value for=AttributionAggregationProtocol>`dap-18-histogram`</a>
 aggregation method uses Prio [[PRIO]]
 and the Distributed Aggregation Protocol (DAP) [[DAP]].
 Specifically, this aggregation method uses
-the <dfn>Prio3L1BoundSum</dfn> instantiation [[PRIO-L1]]
-of the Prio3 Verifiable Distributed Aggregation Function (VDAF) [[VDAF]].
+the <dfn>Prio3L1BoundSum</dfn> [[PRIO-L1]]
+Verifiable Distributed Aggregation Function (VDAF) [[VDAF]].
 
 DAP and the [=Prio3L1BoundSum=] instantiation define how a report is prepared,
 encrypted, and submitted for aggregation.