fix some layers refs

[Wikunia]

How did you address these issues with this PR? What methods did you use?
some of the references in the layers docstrings were wrong. Mixed up whether it's a macro or not.
This is fixed now

[codecov]

Codecov Report

Merging #403 (459d02a) into master (2f9e047) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #403   +/-   ##
=======================================
  Coverage   96.25%   96.25%           
=======================================
  Files          35       35           
  Lines        1521     1521           
=======================================
  Hits         1464     1464           
  Misses         57       57           

Impacted Files	Coverage Δ
src/layers.jl	84.37% <ø> (ø)

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