[Docs] Minor editorial fixes - "token capabilities"

[yhyakuna]

Description

This PR makes minor edits:

• Removed passive voice
• Updated the command examples

TODO only if you're a HashiCorp employee

• [ ] Labels: If this PR is the CE portion of an ENT change, and that ENT change is getting backported to N-2, use the new style backport/ent/x.x.x+ent labels instead of the old style backport/x.x.x labels.
• [x] Labels: If this PR is a CE only change, it can only be backported to N, so use the normal backport/x.x.x label (there should be only 1).
• [ ] ENT Breakage: If this PR either 1) removes a public function OR 2) changes the signature of a public function, even if that change is in a CE file, double check that applying the patch for this PR to the ENT repo and running tests doesn't break any tests. Sometimes ENT only tests rely on public functions in CE files.
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