Document the recommend used of ISMN data in the Verification Datasets Guide

[JohnHalleyGotway]

Describe the Task

Pull request dtcenter/MET#2758 for issue dtcenter/MET#2701 adds support to ascii2nc for handling the -format ismn option for reading soil moisture data (and other variable types too) for the ISMN Network. In addition, issue #2447 updates the ASCII2NC wrapper to handle this new format.

This issue is to update the METplus Verification Datasets Guide (in docs/Verification_Datasets/datasets) to add a description of the how ISMN soil moisture data can be used in verification. Note that this does not need to be very long, and does not need to repeat what's already listed on the ISMN site. Instead, we just want to briefly describe the data source and why/how its useful for verification.

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4 hours?

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[DanielAdriaansen]

@JohnHalleyGotway do you feel this required for the 12.0.0 release because there's an ISMN support in ASCII2NC?