[editorial] Rename resource/k8s/k8s.md to resource/k8s/README.md (#2917)

Author: chalin

.github/CODEOWNERS

@@ -79,8 +79,7 @@
 /model/session/                   @open-telemetry/specs-semconv-approvers @open-telemetry/semconv-client-approvers
 
 # K8s semantic conventions
-/docs/resource/k8s/k8s.md                       @open-telemetry/specs-semconv-approvers @open-telemetry/semconv-k8s-approvers
-/docs/resource/k8s/openshift.md                 @open-telemetry/specs-semconv-approvers @open-telemetry/semconv-k8s-approvers
+/docs/resource/k8s/                             @open-telemetry/specs-semconv-approvers @open-telemetry/semconv-k8s-approvers
 /model/k8s/                                     @open-telemetry/specs-semconv-approvers @open-telemetry/semconv-k8s-approvers
 /docs/non-normative/k8s-attributes.md           @open-telemetry/specs-semconv-approvers @open-telemetry/semconv-k8s-approvers
 /docs/non-normative/k8s-migration.md            @open-telemetry/specs-semconv-approvers @open-telemetry/semconv-k8s-approvers

docs/resource/README.md

@@ -251,7 +251,7 @@ Attributes defining a running environment (e.g. Operating System, Cloud, Data Ce
 - [CICD](./cicd.md)
 - Deployment:
   - [Deployment Environment](./deployment-environment.md)
-  - [Kubernetes](k8s/k8s.md)
+  - [Kubernetes](k8s/README.md)
   - [Openshift](k8s/openshift.md)
   - [CloudFoundry](./cloudfoundry.md)
 - [Browser](./browser.md)

docs/resource/k8s/k8s.md renamed to docs/resource/k8s/README.md

@@ -12,7 +12,7 @@ This document describes instruments and attributes for common K8s level
 metrics in OpenTelemetry. These metrics are collected from technology-specific,
 well-defined APIs (e.g. Kubelet's API).
 
-Metrics in `k8s.` instruments SHOULD be attached to a [K8s Resource](/docs/resource/k8s/k8s.md)
+Metrics in `k8s.` instruments SHOULD be attached to a [K8s Resource](/docs/resource/k8s/README.md)
 and therefore inherit its attributes, like `k8s.pod.name` and `k8s.pod.uid`.
 
 <!-- toc -->