Fixed mistake in presentation (tnx. boldt) [#CLICKHOUSE-3].

doc/presentations/evolution/index_en.html

@@ -114,7 +114,7 @@
 	<section class="slide">
 		<h2>MySQL (MyISAM) 2008-2011</h2>
 		<p>As of 2011 we was storing about 580 billion rows in MyISAM tables.</p>
-		<p>We was not satisfied by performance and maintenance cost:<br/>
+		<p>We were not satisfied by performance and maintenance cost:<br/>
 		Example: page title report loading time, 90% quantile was more than 10 seconds.</p>
 		<p>... After all, everything was converted and deleted.</p>
 	</section>