Docs update: Frequency Plans - Ecuador

[ticlatam]

Summary

1. Add LoRa Alliance Frequency Parameters link
2. Update Ecuador's frequency plan.
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Why do we need this ?

Wrong data may cause several issues.
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What is already there? What do you see now?

US902-928
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What is missing? What do you want to see?

AU915-928
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How do you propose to document this?

Edit table.
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Can you do this yourself and submit a Pull Request?

Yes.
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