docs: improve network table formatting and label Betanet as current

[moul]

Improves the network table in docs/resources/gnoland-networks.md:

• Wider column formatting for readability
• Labels Betanet as (current) to make it clear it is the live network

Part of the gnoland-1 hard fork prep work (#5376), extracted so it can merge independently.

[Gno2D2]

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