Documentation of model vs. instance methods.

[jcfergus]

Adding clarification in Guide between Model and Instance methods, to save future explorers some digging.

Type of PR:

• [ ] Bugfix
• [ ] Feature
• [ ] Code style update
• [ ] Refactor
• [ ] Build-related changes
• [X] Documentation
• [ ] Other, please describe:

Breaking changes:

• [X] No
• [ ] Yes

Details

Adding a bit of documentation on model methods vs instance methods, since it took me a little digging to find out the difference.

[codecov[bot]]

Codecov Report

Merging #687 into master will not change coverage. The diff coverage is n/a.

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##            master      #687   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           47        47           
  Lines         1554      1554           
  Branches       260       260           
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  Hits          1554      1554           

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