message: docs: add namespace flag for retrieve token example
diff: @@ -38,7 +38,7 @@ To retrieve the token,
  ### On Linux/macOS:
  ```bash
  -kubectl get secret $(kubectl get serviceaccount kubeapps-operator -o jsonpath='{range .secrets[*]}{.name}{"\n"}{end}' | grep kubeapps-operator-token) -o jsonpath='{.data.token}' -o go-template='{{.data.token | base64decode}}' && echo
  +kubectl get --namespace default secret $(kubectl get --namespace default serviceaccount kubeapps-operator -o jsonpath='{range .secrets[*]}{.name}{"\n"}{end}' | grep kubeapps-operator-token) -o jsonpath='{.data.token}' -o go-template='{{.data.token | base64decode}}' && echo
  ```
  ### On Windows:
  @@ -48,12 +48,12 @@ Create a file called `GetDashToken.cmd` with the following lines in it:
  ```bat
  @ECHO OFF
  REM Get the Service Account
  -kubectl get serviceaccount kubeapps-operator -o jsonpath={.secrets[].name} > s.txt
  +kubectl get --namespace default serviceaccount kubeapps-operator -o jsonpath={.secrets[].name} > s.txt
  SET /p ks=<s.txt
  DEL s.txt
  REM Get the Base64 encoded token
  -kubectl get secret %ks% -o jsonpath={.data.token} > b64.txt
  +kubectl get --namespace default secret %ks% -o jsonpath={.data.token} > b64.txt
  REM Decode The Token
  DEL token.txt
  