[DOCS] Update RPC methods with op stack chain info

[cpengilly]

Brief Description of the Docs Request

There are a few outstanding items on rpc methods that require updating from a developer running an op stack chain.

Description of the Documentation You'd Like

• [ ] admin section, needs description
• [ ] this item, needs sample success output
• [ ] this item, missing sample success output
• [ ] this item, needs sample success output
• [ ] this last item, missing sample success output

Links to Related Pages

n/a

Additional Context

We want to provide the community with complete documentation. :)