add inclusivity default info to the docstrings for HourEnding and HourBeginning

[mzgubic]

Closes #77

[codecov]

Codecov Report

Merging #138 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #138   +/-   ##
=======================================
  Coverage   74.23%   74.23%           
=======================================
  Files          10       10           
  Lines         458      458           
=======================================
  Hits          340      340           
  Misses        118      118           

Impacted Files	Coverage Δ
src/anchoredinterval.jl	96.15% <ø> (ø)

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[omus]

I like the addition but it needed some additional clarification. Let me know if these make sense to you

[mzgubic]

I like the addition but it needed some additional clarification. Let me know if these make sense to you

Thanks for the review, yes it is much clearer this way.