Update docs with correct cookie-algorithm values

The documentation was inconsistent with the code. The new description
for cookie-algorithm now reflects the current behavior.

The following two commits are the relevant code changes to this
section of docs: afa81ee4 a912f313
68 jobs for !5573 with doc-fix-cookie-algorithm-desc in 30 minutes and 12 seconds (queued for 19 seconds)
latest merge request