Fix typo in docs

[JacobLuhn]

No description provided.

[codecov]

Codecov Report

Merging #29 (5bf2986) into master (454e08d) will decrease coverage by 0.96%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #29      +/-   ##
==========================================
- Coverage   98.58%   97.61%   -0.97%     
==========================================
  Files           8        8              
  Lines         283      294      +11     
==========================================
+ Hits          279      287       +8     
- Misses          4        7       +3     

Impacted Files	Coverage Δ
src/townsend.jl	95.45% <0.00%> (-4.55%)	⬇️
src/gls.jl	96.77% <0.00%> (-3.23%)	⬇️
src/utils.jl	100.00% <0.00%> (ø)
src/LombScargle.jl	100.00% <0.00%> (ø)
src/extirpolation.jl	100.00% <0.00%> (ø)
src/press-rybicki.jl	100.00% <0.00%> (ø)

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