Fix REPL blocks in docs

[jakobnissen]

Fix #195

[codecov]

Codecov Report

Merging #197 (ff10564) into master (d51a551) will decrease coverage by 0.60%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #197      +/-   ##
==========================================
- Coverage   83.03%   82.42%   -0.61%     
==========================================
  Files          45       45              
  Lines        3082     3397     +315     
==========================================
+ Hits         2559     2800     +241     
- Misses        523      597      +74     

Flag	Coverage Δ
unittests	82.42% <100.00%> (-0.61%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/BioSequences.jl	0.00% <ø> (-50.00%)	⬇️
src/biosequence/biosequence.jl	82.75% <100.00%> (+24.42%)	⬆️
src/longsequences/indexing.jl	100.00% <100.00%> (ø)
src/bit-manipulation/bitpar-compiler.jl	38.46% <0.00%> (-21.86%)	⬇️
src/geneticcode.jl	59.25% <0.00%> (-15.99%)	⬇️
src/longsequences/transformations.jl	91.30% <0.00%> (-2.64%)	⬇️
src/biosequence/transformations.jl	78.37% <0.00%> (-0.79%)	⬇️
src/minhash.jl	67.85% <0.00%> (-0.78%)	⬇️
src/biosequence/find.jl	54.54% <0.00%> (-0.63%)	⬇️
... and 35 more

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[jakobnissen]

The ambiguities strike again. This is a symtom of an underlying issue fixed in v3. For now, I paper over it with a few more methods.