small fixes to docs

[rbroc]

fixed typo in dataset description and added note on absolute paths needed to run analyses via neuroscout-cli.

[rbroc]

More potential edits:

• Add more details on sparse/dense feature representations?
• Add more details on how data are preprocessed
• Add overview of which features are available for each dataset/modality
• Add more details on na replacement during transformation (why/when to replace NAs before rather then after when rescaling)
• Potentially more info on terminology ("task", "run", "condition")
• More info on stats behind model estimation (e.g. the concept of "fixed effects meta-analysis" at the subject level? Maybe this details can be included in the paper though)
• Potentially add details on relevant Docker commands and flags in Run analysis section

[codecov-io]

Codecov Report

Merging #703 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #703   +/-   ##
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  Coverage   85.67%   85.67%           
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  Files          66       66           
  Lines        2932     2932           
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  Hits         2512     2512           
  Misses        420      420

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