[C++][Doc] PlasmaClient is threadSafe now, doc not update #26878
Description
There's a pr #4503 make PlasmaClient thread safe now, but in the doc there's "Note that a PlasmaClient object is not thread safe.", which causes misunderstanding.
Reporter: Xudingyu / @offthewall123
Assignee: Xudingyu / @offthewall123
PRs and other links:
Note: This issue was originally created as ARROW-10954. Please see the migration documentation for further details.