update SIS api docs about stickyness
update SIS api docs about stickyness

closes CNVS-29185

test plan: make sure SIS api docs about stickyness look right

Change-Id: I4f3f1ce3d8172b4027cd31b02e73a5db0273afdb
Reviewed-on: https://gerrit.instructure.com/100329
Tested-by: Jenkins
Reviewed-by: Tyler Pickett <3f20fcf21b1970c94966160adcf831eedd808a06@instructure.com>
Product-Review: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>
QA-Review: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>

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