Add section to user's guide describing how to use fates tools

[glemieux]

Is your feature request related to a problem? Please describe.
The fates tools currently rely on in-code comments and script help function outputs. We should provide more comprehensive "how-to" and reference documentation on the tools.

Describe the solution you'd like
Add sections for tooling in the "how-to" and "references" subsections.

Describe alternatives you've considered
READMEs could also be included in the tooling directories as well. These could also point to the user's guide.

Tasks

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1. Add land use tool usage documentation to the fates user's guide tools-fates-landusedata#9
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