Specify discouraged paths for mount points
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Issue body
### Request type
Enhancement
### What needs to get done
It would be handy if we provided some additional insight about storage locations, specifically discouraging some location.
```yaml
storage:
# ...
# (Optional) The mount location for filesystem stores. For multi-stores
# the location acts as the parent directory for each mounted store.
location: <location>
```
For example, we could say
> Do not use `/charm` or `/tmp` for the location.
### Documentation location
https://canonical-charmcraft.readthedocs-hosted.com/en/stable/reference/files/charmcraft-yaml-file/#storage
### Additional information
_No response_
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