Update changelog files (#1995)

.changelog/1519.txt

@@ -0,0 +1,7 @@
+```release-note:bug
+`resource/kubernetes_storage_class`: Fix an issue when changing the value of the attribute `allow_volume_expansion` does not alter Kubernetes resource.
+```
+
+```release-note:bug
+`resource/kubernetes_storage_class_v1`: Fix an issue when changing the value of the attribute `allow_volume_expansion` does not alter Kubernetes resource.
+```

.changelog/1921.txt

@@ -1,4 +1,15 @@
 ```release-note:feature
-New data source: `kubernetes_nodes`
-New resource: `kubernetes_node_taint`
+New data source: `kubernetes_nodes`.
+```
+
+```release-note:feature
+New resource: `kubernetes_node_taint`.
+```
+
+```release-note:doc
+New data source: `kubernetes_nodes`.
+```
+
+```release-note:doc
+New resource: `kubernetes_node_taint`.
 ```

.changelog/1967.txt

@@ -1,3 +1,7 @@
 ```release-note:feature
-Add kubernetes_resources data source
+New data source: `kubernetes_resources`.
+```
+
+```release-note:doc
+New data source: `kubernetes_resources`.
 ```

.changelog/1971.txt

@@ -1,3 +1,7 @@
 ```release-note:enhancement
-`resource/resource_kubernetes_cron_job_v1`: new attribute `spec.timezone`
+`resource/resource_kubernetes_cron_job_v1`: Add a new attribute `spec.timezone`.
+```
+
+```release-note:doc
+`resource/resource_kubernetes_cron_job_v1`: Add a new attribute `spec.timezone`.
 ```

.changelog/1972.txt

@@ -1,3 +1,7 @@
 ```release-note:enhancement
-Add support for adding annotations to resources with pod templates
+`resource/kubernetes_annotations`: Add a new attribute `template_annotations` that allows adding annotations to resources with pod templates.
+```
+
+```release-note:doc
+`resource/kubernetes_annotations`: Add a new attribute `template_annotations`.
 ```

.changelog/1989.txt

@@ -0,0 +1,3 @@
+```release-note:doc
+`provider`: Add a note regarding the `KUBECONFIG` environment variable.
+```