added note to sinusoid docs about phase shift

[odunbar]

Purpose

Addressing #285

Content

• Adds a sentence clarifying the roles of \phi f G in sinusoid example

See result here

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• I have read and checked the items on the review checklist.

[odunbar]

One sentence changed in docs- therefore skipping review for this PR

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.26%. Comparing base (acf1051) to head (9662ce0).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #295      +/-   ##
==========================================
+ Coverage   88.17%   88.26%   +0.08%     
==========================================
  Files           8        8              
  Lines        1184     1184              
==========================================
+ Hits         1044     1045       +1     
+ Misses        140      139       -1     

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