Small needed docs changes

[MartinuzziFrancesco]

No description provided.

[codecov]

Codecov Report

Merging #132 (b4bce7a) into master (b320950) will decrease coverage by 86.59%.
The diff coverage is 0.00%.

❗ Current head b4bce7a differs from pull request most recent head 0a9fe2e. Consider uploading reports for the commit 0a9fe2e to get more accurate results

@@            Coverage Diff             @@
##           master    #132       +/-   ##
==========================================
- Coverage   86.59%   0.00%   -86.60%     
==========================================
  Files          12      12               
  Lines         597     609       +12     
==========================================
- Hits          517       0      -517     
- Misses         80     609      +529     

Impacted Files	Coverage Δ
src/ReservoirComputing.jl	0.00% <ø> (-100.00%)	⬇️
src/esn/echostatenetwork.jl	0.00% <ø> (-90.15%)	⬇️
src/esn/esn_predict.jl	0.00% <0.00%> (-93.11%)	⬇️
src/esn/esn_reservoir_drivers.jl	0.00% <ø> (-93.52%)	⬇️
src/reca/reca.jl	0.00% <0.00%> (-100.00%)	⬇️
src/train/linear_regression.jl	0.00% <0.00%> (-100.00%)	⬇️
src/reca/reca_input_encodings.jl	0.00% <0.00%> (-100.00%)	⬇️
src/train/supportvector_regression.jl	0.00% <0.00%> (-100.00%)	⬇️
src/states.jl	0.00% <0.00%> (-93.88%)	⬇️
... and 6 more

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[MartinuzziFrancesco]

the changes here were added in #143, we can close this. I'll open a new one with the overhaul of the docs in the coming days