Fix title in acf plot

[julia-shenshina]

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• Examples / docs / tutorials / contributors update
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[codecov-commenter]

Codecov Report

Merging #432 (176c3f1) into master (3eb2638) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master     #432   +/-   ##
=======================================
  Coverage   87.64%   87.64%           
=======================================
  Files         112      112           
  Lines        5276     5276           
=======================================
  Hits         4624     4624           
  Misses        652      652           

Impacted Files	Coverage Δ
etna/analysis/eda_utils.py	19.58% <0.00%> (ø)

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