[bitnami/several] Adapt READMEs and helpers to Helm 3 (#1911)

* [bitnami/several] Adapt READMEs and helpers to Helm 3

* Update _docs

bitnami/node-exporter/Chart.yaml

@@ -2,7 +2,7 @@ apiVersion: v1
 appVersion: 0.18.1
 description: Prometheus exporter for hardware and OS metrics exposed by UNIX kernels, with pluggable metric collectors.
 name: node-exporter
-version: 0.2.1
+version: 0.2.2
 keywords:
   - prometheus
   - node-exporter

bitnami/node-exporter/README.md

@@ -6,7 +6,7 @@
 
 ```bash
 $ helm repo add bitnami https://charts.bitnami.com/bitnami
-$ helm install bitnami/node-exporter
+$ helm install my-release bitnami/node-exporter
 ```
 
 ## Introduction
@@ -31,7 +31,7 @@ $ helm repo add bitnami https://charts.bitnami.com/bitnami
 To install the chart with the release name `my-release`:
 
 ```bash
-$ helm install --name my-release bitnami/node-exporter
+$ helm install my-release bitnami/node-exporter
 ```
 
 The command deploys Node Exporter on the Kubernetes cluster in the default configuration. The [configuration](#configuration) section lists the parameters that can be configured during installation.
@@ -115,13 +115,13 @@ The following table lists the configurable parameters of the Node Exporter chart
 Specify each parameter using the `--set key=value[,key=value]` argument to `helm install`. For example the following command sets the `minReadySeconds` of the Node Exporter Pods to `120` seconds.
 
 ```bash
-$ helm install --name my-release --set minReadySeconds=120 bitnami/node-exporter
+$ helm install my-release --set minReadySeconds=120 bitnami/node-exporter
 ```
 
 Alternatively, a YAML file that specifies the values for the parameters can be provided while installing the chart. For example,
 
 ```bash
-$ helm install --name my-release -f values.yaml bitnami/node-exporter
+$ helm install my-release -f values.yaml bitnami/node-exporter
 ```
 
 > **Tip**: You can use the default [values.yaml](values.yaml)