doc: use lower case for "cloud native"
Fixed upper case letter typo
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-Open Service Mesh (OSM) is a lightweight, extensible, Cloud Native [service mesh][1] that allows users to uniformly manage, secure, and get out-of-the-box observability features for highly dynamic microservice environments.
+Open Service Mesh (OSM) is a lightweight, extensible, cloud native [service mesh][1] that allows users to uniformly manage, secure, and get out-of-the-box observability features for highly dynamic microservice environments.
The OSM project builds on the ideas and implementations of many cloud native ecosystem projects including [Linkerd](https://github.com/linkerd/linkerd), [Istio](https://github.com/istio/istio), [Consul](https://github.com/hashicorp/consul), [Envoy](https://github.com/envoyproxy/envoy), [Kuma](https://github.com/kumahq/kuma), [Helm](https://github.com/helm/helm), and the [SMI](https://github.com/servicemeshinterface/smi-spec) specification.
