Update beta calibration docs

[btrotta-bom]

Follow-up to #2078

• Fix an issue where the extended docs were not included properly and did not appear in the html.
• Add more detail about how to choose the parameters of the beta distribution.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.41%. Comparing base (84a8944) to head (73f3766).
Report is 72 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2097      +/-   ##
==========================================
+ Coverage   98.39%   98.41%   +0.01%     
==========================================
  Files         124      135      +11     
  Lines       12212    13304    +1092     
==========================================
+ Hits        12016    13093    +1077     
- Misses        196      211      +15     

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[benowen-bom]

Looks good to me. I think outlining how to determine alpha and beta values is important element to promote the use/uptake of this CLI.

[benowen-bom]

Looks good to me. I think outlining how to determine alpha and beta values is important element to promote the use/uptake of this CLI.

[bayliffe]

I've checked both the local build and the build on read-the-docs. Both appear to work fine, so thanks for this.

[bayliffe]

Thanks for the additional detail.