chore(ONRAMP-5024): Update docs. Add apiKey to onramp utils

[rustam-cb]

What changed? Why?
Updated documentation to mention apiKey as an optional param in the onramp utils. Added missing iconUrl prop as well
Notes to reviewers

How has it been tested?

Have you tested the following pages?

BaseWeb

• [] base.org
• [] base.org/names
• [] base.org/builders
• [] base.org/ecosystem
• [] base.org/name/jesse
• [] base.org/manage-names
• [] base.org/resources

BaseDocs

• [] docs.base.org
• [] docs sub-pages

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[cb-heimdall]

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