Bug: Address bulk selector style discrepancy and docs demo behavior.

[edonehoo]

Creating a follow-up for patternfly/patternfly-org#4620

Original description:

the bulk select component group should be edited to remove the divider between the toggle text & caret. component group example should also follow the design guidelines noted above & on our bulk select pattern design guidelines page.

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Jira Issue: PF-3621