correction in docs of coherence.R for solving issue #316

[manuelbickel]

Solves #316 See comments in this issue for explanations of the correction.

[codecov[bot]]

Codecov Report

Merging #317 into master will decrease coverage by 0.23%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #317      +/-   ##
==========================================
- Coverage   82.05%   81.82%   -0.24%     
==========================================
  Files          36       36              
  Lines        1923     1887      -36     
==========================================
- Hits         1578     1544      -34     
+ Misses        345      343       -2

Impacted Files	Coverage Δ
R/coherence.R	99.12% <ø> (ø)	:arrow_up:
src/SparseTripletMatrix.h	100% <0%> (ø)	:arrow_up:
src/Vocabulary.h	90.62% <0%> (+1.01%)	:arrow_up:

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[dselivanov]

Thanks!