update releases web summary

Author: sarahhaggarty

docs/topics/releases.md

@@ -1,6 +1,6 @@
 [//]: # (title: Kotlin release process)
 
-<web-summary>Learn about the different types of Kotlin releases there are, how to update to each one, and the history of all releases to date.</web-summary>
+<web-summary>Learn about the different types of Kotlin releases, how to update to each one, and Kotlin's release history.</web-summary>
 
 <tldr>
     <p>Latest Kotlin version: <strong>%kotlinVersion%</strong></p>