HPE 3PAR, HPE Primera and HPE Alletra 9k Driver in cinder

[Lucas Maurice]

- [x] This doc is inaccurate in this way: missing variable name in configuration example
- [ ] This is a doc addition request.
- [x] I have a fix to the document that I can paste below including example: input and output.

In `Enable the HPE 3PAR Fibre Channel and iSCSI drivers`, section 5.

The WSAPI Server URL is given without the variable name.

Now it is:

```
# WSAPI Server URL.
# This setting applies to all: 3PAR, Primera and Alletra 9k.
# Example 1: for 3PAR, URL is:
https://<3par ip>:8080/api/v1

# Example 2: for Primera/Alletra 9k, URL is:
https://<primera/alletra_9k ip>:443/api/v1
```

It should be:

```
# WSAPI Server URL.
# This setting applies to all: 3PAR, Primera and Alletra 9k.
# Example 1: for 3PAR, URL is:
hpe3par_api_url=https://<3par ip>:8080/api/v1

# Example 2: for Primera/Alletra 9k, URL is:
hpe3par_api_url=https://<primera/alletra_9k ip>:443/api/v1
```

-----------------------------------
Release: 24.1.0.dev13 on 2021-08-24 08:56:28
SHA: 1f7e2c8bd062c84ae201c24d8fdeb527ad581fad
Source: https://opendev.org/openstack/cinder/src/doc/source/configuration/block-storage/drivers/hpe-3par-driver.rst
URL: https://docs.openstack.org/cinder/latest/configuration/block-storage/drivers/hpe-3par-driver.html