get_psm3 with tmy will not ignore interval

[mikofski]

Describe the bug
docs say if names='tmy' then interval is ignored, but the nrel api raises an HTTPError

To Reproduce
Steps to reproduce the behavior:

d, m = pvl.iotools.get_psm3(
    latitude=38.8, longitude=-121.2,
    api_key='DEMO_KEY', email='email@example.com',
    names='tmy', interval=5)

Expected behavior
NREL API ignores interval

Screenshots

Versions:

• pvlib.__version__: 1.5.2
• pandas.__version__: 0.9.4
• python: 3.8.15

Additional context
I think the documentation should be updated?

[AdamRJensen]

I can confirm this issue.

The current parameter description reads:

interval (int, {60, 5, 15, 30}) – interval size in minutes, must be 5, 15, 30 or 60. Only used for single-year requests (i.e., it is ignored for tmy/tgy/tdy requests).

Should be updated to something along the lines of:

interval (int, {60, 5, 15, 30}) – interval size in minutes, must be 5, 15, 30 or 60. Must be 60 for typical year requests (e.g., tmy/tgy/tdy).