Update docs/integrations/knowledge-base.md

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

Author: NickBusey

docs/integrations/knowledge-base.md

@@ -1,6 +1,6 @@
 ---
 title: Knowledge Base
-description: Integrate CodeRabbit with an external knowledge base for issue tracking.
+description: Learn about CodeRabbit's internal knowledge base and its integrations with external services.
 sidebar_label: Knowledge Base
 sidebar_position: 4
 ---