Improve wording for what the changelog offers (#1427)

Author: eseliger

docs/technical-changelog.mdx

@@ -1,6 +1,6 @@
 # Technical Changelog
 
-This page documents all notable changes to Sourcegraph. For more detailed changelog posts, please [read here](https://sourcegraph.com/changelog/).
+This page documents all notable changes to Sourcegraph. For curated highlights of key changes, please [read here](https://sourcegraph.com/changelog/).
 
 {/* CHANGELOG_START */}