Add fractions caveat to Trailing Digits artifact

[Dev-Lan]

The current list of artifacts of manipulation can be improved by:

modifying existing artifacts

Suggested Change:

A good caveat to point out for trailing digits is the fractional numbers again. E.g. if you have thirds stored as decimal, then 3 (0.33333) and 7 (0.666667) will be more common than expected.

The following "clean" datasets exhibit this artifact:

https://www.cbioportal.org/study/summary?id=metastatic_solid_tumors_mich_2017

Related Paper:

https://pubmed-ncbi-nlm-nih-gov.ezproxy.lib.utah.edu/28783718/