[docs]: Incorrect guide for loading NoCloud config from local filesystem.

[MarekZydor]

Documentation request

As described, configuration can be loaded from the local filesystem using the following format:
ds=nocloud;s=file://path/to/directory/

But, the prefix file:// is inappropriate as it corrupts the path. The correct version is:
ds=nocloud;s=/path/to/directory/
Additionally, it is recommended to mention in the documentation that only two configuration files are required:

• user-data
• meta-data (must exist even if empty)

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Reported from: https://cloudinit.readthedocs.io/en/latest/reference/datasources/nocloud.html