Merge pull request #29093 from mengjiao-liu/fix-observability-format

Fix Observability format to be consistent with other list items

Author: k8s-ci-robot

content/en/docs/concepts/overview/what-is-kubernetes.md

@@ -45,7 +45,7 @@ Containers have become popular because they provide extra benefits, such as:
 * Agile application creation and deployment: increased ease and efficiency of container image creation compared to VM image use.
 * Continuous development, integration, and deployment: provides for reliable and frequent container image build and deployment with quick and efficient rollbacks (due to image immutability).
 * Dev and Ops separation of concerns: create application container images at build/release time rather than deployment time, thereby decoupling applications from infrastructure.
-* Observability not only surfaces OS-level information and metrics, but also application health and other signals.
+* Observability: not only surfaces OS-level information and metrics, but also application health and other signals.
 * Environmental consistency across development, testing, and production: Runs the same on a laptop as it does in the cloud.
 * Cloud and OS distribution portability: Runs on Ubuntu, RHEL, CoreOS, on-premises, on major public clouds, and anywhere else.
 * Application-centric management: Raises the level of abstraction from running an OS on virtual hardware to running an application on an OS using logical resources.