docs: edit farming spec to improve documentation quality (part of #172)

[barriebyron]

Description

edit farming spec to improve documentation quality #172
(this is a recovery PR: the original work was done in #188 but Barrie overwrite the changes, so getting fresh PR to capture all of the edits)

part of #172

Tasks

• [ ]

References

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Before we can merge this PR, please make sure that all the following items have been
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• Appropriate labels applied
• Targeted PR against correct branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code follows the module structure standards.
• Wrote unit and integration
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added relevant godoc comments.
• Re-reviewed Files changed in the Github PR explorer
• Review Codecov Report in the comment section below once CI passes

[jaybxyz]

LGTM. As far as I can tell, nothing is merged to master branch at this moment. So I believe we can ignore the #188?

[dongsam]

LGTM!