Minor docs improvements.

[seldon]

See: #105

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.58%. Comparing base (863ba39) to head (28dec5e).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #106   +/-   ##
=======================================
  Coverage   98.58%   98.58%           
=======================================
  Files           4        4           
  Lines         282      282           
  Branches       38       38           
=======================================
  Hits          278      278           
  Misses          2        2           
  Partials        2        2           

Files with missing lines	Coverage Δ
itemloaders/__init__.py	100.00% <ø> (ø)
itemloaders/processors.py	100.00% <ø> (ø)

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