Merge pull request #4625 from ClickHouse/fix-BYOC-documentation-section-title

fix(byoc): fix BYOC doc section title

Author: Blargian

docs/cloud/guides/infrastructure/01_deployment_options/byoc/05_observability/_category_.json

@@ -1,5 +1,5 @@
 {
-  "label": "Onboarding",
+  "label": "Observability",
   "collapsible": true,
   "collapsed": true
 }