[Documentation]: Link to NWBInspector from the validator

[oruebel]

What would you like changed or added to the documentation and why?

The PyNWB validator checks for structural compliance of NWB files. In practice, however, most users should validate both structural compliance with the NWB schema as well as compliance of the data itself with NWB best practice. Users should, hence, be pointed to the NWBInspector, which runs both the PyNWB validator and additional data checks. To do this we should:

1. Update the tutorial on Validating NWB Files to point to the nwbinspector
2. Add a note to the the validator command line to to indicate that use of the NWBInspector is recommended
3. Add a not to the docstring of the validate method to describe that the function only checks for compliance with the NWB schema and that users should use the NWBInspector for additional validation with NWB best practices.

Do you have any interest in helping write or edit the documentation?

Yes.

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