Remove hyphens from "user agent" in abstract (#445)

The term is simply "user agent".

Author: martinthomson

api.bs

@@ -12,7 +12,7 @@ Editor: Benjamin Case, w3cid 128082, Meta https://www.meta.com/, bmcase@meta.com
 Editor: Benjamin Savage, w3cid 114877, Meta https://www.meta.com/, btsavage@meta.com
 Editor: Charlie Harrison, w3cid 110615, Google https://www.google.com/, csharrison@chromium.org
 Editor: Martin Thomson, w3cid 68503, Mozilla https://mozilla.org/, mt@mozilla.com
-Abstract: This specifies a browser API for the measurement of advertising performance.  The goal is to produce aggregate statistics about how advertising leads to conversions, without creating a risk to the privacy of individual web users.  This API collates information about people from multiple web origins, which could be a significant risk to their privacy.  To manage this risk, the information that is gathered is aggregated using an aggregation service that is trusted by the user-agent to perform aggregation within strict limits.  Noise is added to the aggregates produced by this service to provide differential privacy. Websites may select an aggregation service from the list of approved aggregation services provided by the user-agent.
+Abstract: This specifies a browser API for the measurement of advertising performance.  The goal is to produce aggregate statistics about how advertising leads to conversions, without creating a risk to the privacy of individual web users.  This API collates information about people from multiple web origins, which could be a significant risk to their privacy.  To manage this risk, the information that is gathered is aggregated using an aggregation service that is trusted by the user agent to perform aggregation within strict limits.  Noise is added to the aggregates produced by this service to provide differential privacy. Websites may select an aggregation service from the list of approved aggregation services provided by the user agent.
 Complain About: accidental-2119 yes, missing-example-ids yes
 Markup Shorthands: markdown yes, css no, dfn yes
 Assume Explicit For: yes