added instructions for social contact methods
added instructions for social contact methods

fixes #9838

Change-Id: Idb629a4db76697092a195f80d01ba7d3b99e2904
Reviewed-on: https://gerrit.instructure.com/12985
Reviewed-by: Jon Jensen <44f878afe53efc66b76772bd845eb65944ed8232@instructure.com>
Tested-by: Bryan Madsen <0a3ba1af216659500dd8f41e29f3979f42452870@instructure.com>

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