Documentation update for bug_2313 user management env variable

# The role should include the permission "users:id:patch" set to true

```

### How to update enforced password best practices

If you want to edit the default best practices enabled in osm, set the values of the following environment variables:

- "OSMNBI_PWD_EXPIRE_DAYS"

- "OSMNBI_MAX_PWD_ATTEMPT"

- "OSMNBI_ACCOUNT_EXPIRE_DAYS" 

in the nbi config map with the following command:

```bash

kubectl -n osm edit configmap nbi

```

```yaml

OSMNBI_PWD_EXPIRE_DAYS: "50"

OSMNBI_MAX_PWD_ATTEMPT: "10"

OSMNBI_ACCOUNT_EXPIRE_DAYS: "100"

```

### How to manage user password updates and user locks

- To change the default password or expired password of a user, execute the following command through CLI.