[stable/opencart] Adapt docs to Helm 3 (#20666)

Signed-off-by: Carlos Rodriguez Hernandez <crhernandez@bitnami.com>

stable/opencart/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v1
 name: opencart
-version: 7.0.4
+version: 7.0.5
 appVersion: 3.0.3-2
 description: A free and open source e-commerce platform for online merchants. It provides a professional and reliable foundation for a successful online store.
 keywords:

stable/opencart/README.md

@@ -5,7 +5,7 @@
 ## TL;DR;
 
 ```console
-$ helm install stable/opencart
+$ helm install my-release stable/opencart
 ```
 
 ## Introduction
@@ -28,7 +28,7 @@ Bitnami charts can be used with [Kubeapps](https://kubeapps.com/) for deployment
 To install the chart with the release name `my-release`:
 
 ```console
-$ helm install --name my-release stable/opencart
+$ helm install my-release stable/opencart
 ```
 
 The command deploys OpenCart on the Kubernetes cluster in the default configuration. The [Parameters](#parameters) section lists the parameters that can be configured during installation.
@@ -135,7 +135,7 @@ The above parameters map to the env variables defined in [bitnami/opencart](http
 Specify each parameter using the `--set key=value[,key=value]` argument to `helm install`. For example,
 
 ```console
-$ helm install --name my-release \
+$ helm install my-release \
   --set opencartUsername=admin,opencartPassword=password,mariadb.mariadbRootPassword=secretpassword \
     stable/opencart
 ```
@@ -145,7 +145,7 @@ The above command sets the OpenCart administrator account username and password
 Alternatively, a YAML file that specifies the values for the above parameters can be provided while installing the chart. For example,
 
 ```console
-$ helm install --name my-release -f values.yaml stable/opencart
+$ helm install my-release -f values.yaml stable/opencart
 ```
 
 > **Tip**: You can use the default [values.yaml](values.yaml)