chore: tidy up index.html (#319)

Co-authored-by: npm1 <npm1@users.noreply.github.com>

Author: github-actions[bot]

index.html

@@ -259,9 +259,10 @@ <h3>
           <a data-cite=
           "PERFORMANCE-TIMELINE-2#performance-timeline">Performance
           Timeline</a>, unless excluded from the timeline as part of the
-          [=fetch|fetching process=]. Resources that are retrieved from
-          HTTP cache are included as <a>PerformanceResourceTiming</a> objects in the
-          <a data-cite="PERFORMANCE-TIMELINE-2#performance-timeline">Performance
+          [=fetch|fetching process=]. Resources that are retrieved from HTTP
+          cache are included as <a>PerformanceResourceTiming</a> objects in the
+          <a data-cite=
+          "PERFORMANCE-TIMELINE-2#performance-timeline">Performance
           Timeline</a>. Resources for which the [=fetch=] was initiated, but
           was later aborted (e.g. due to a network error) are included as
           <a>PerformanceResourceTiming</a> objects in the <a data-cite=