docs: use RegisterWorkflow instead of On

[abelanger5]

Description

Switch to using RegisterWorkflow in all Go examples instead of On.

Type of change

• [X] Documentation change (pure documentation change)

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Name	Status	Preview	Comments	Updated (UTC)
hatchet-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 27, 2024 0:04am