Update docs for ascendNaturally and descendNaturally

[Harris-Miller]

While working on ramda/types#127 I noticed that the block comment docs are a bit off because of how these are implemented

https://github.com/ramda/ramda/pull/3442/files#diff-2f0444491e08d72d422c4e936a1e621a9a3fdb85d20da37118526f4df5bb5ddaR35

.localeCompare only exists on the prototype of string. This means that the compare function for ascendNaturally and descendNaturally need to return String, and not Ord. Ord is defined as number | string | boolean | Date, which are the only types in javascript you can use <, >, <=, and >= on. This makes since for ascend and descend of course, but trying those with ascendNaturally and descendNaturally will give you a runtime error

[github-actions]

Coverage Summary

> ramda@0.30.1 coverage:summary
> BABEL_ENV=cjs nyc --reporter=text-summary mocha -- --reporter=min --require @babel/register

�[2J�[1;3H
1192 passing (1s)


=============================== Coverage summary ===============================
Statements   : 94.06% ( 2486/2643 )
Branches     : 85.76% ( 970/1131 )
Functions    : 93.28% ( 555/595 )
Lines        : 94.34% ( 2332/2472 )
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[Harris-Miller]

CC: @sebbayer