[stable/ghost] Adapt docs to Helm 3 (#20684)

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

stable/ghost/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v1
 name: ghost
-version: 9.1.6
+version: 9.1.7
 appVersion: 3.5.0
 description: A simple, powerful publishing platform that allows you to share your stories with the world
 keywords:

stable/ghost/README.md

@@ -5,7 +5,7 @@
 ## TL;DR;
 
 ```console
-$ helm install stable/ghost
+$ helm install my-release stable/ghost
 ```
 
 ## 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/ghost
+$ helm install my-release stable/ghost
 ```
 
 The command deploys Ghost on the Kubernetes cluster in the default configuration. The [Parameters](#parameters) section lists the parameters that can be configured during installation.
@@ -150,7 +150,7 @@ The above parameters map to the env variables defined in [bitnami/ghost](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 ghostUsername=admin,ghostPassword=password,mariadb.mariadbRootPassword=secretpassword \
     stable/ghost
 ```
@@ -160,7 +160,7 @@ The above command sets the Ghost administrator account username and password to
 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/ghost
+$ helm install my-release -f values.yaml stable/ghost
 ```
 
 > **Tip**: You can use the default [values.yaml](values.yaml)