[css-contain] Fix stray text in report

Author: frivoal

css-contain-1/implementation-report-2019-09.html

@@ -166,10 +166,10 @@ <h2 id=method><a href="#method" class=self-link></a>2. Methodology</h2>
 <p>A <a href="https://test.csswg.org/harness/results/css-contain-1_dev/<Paste>">continuously updated version of the test suite</a> is available.
 This report was prepared using the tests and their results as of 5 September 2019.
 
-<p>This report was prepared on the basis of testing 4 browser engines:
+<p>This report was prepared on the basis of testing 2 browser engines:
 
 <ul class=short-list>
-	<li>Firefox (engine: Gecko, version 70.0a1)
+	<li>Firefox (engine: Gecko, version 70)
 	<li>Chrome (engine: Blink, version 78)
 </ul>