Docs: rest-api-go uses an SaaS service API which is now deleted.

[d2iq-shadowbq]

Expected Behavior

A sample application in the documentation should work as expected.

https://github.com/knative/docs/blob/06881add07600c2e8252e77a45aa489714710c1a/docs/serving/samples/rest-api-go/stock.go#L66

A price is returned

Actual Behavior

The docs reference in a sample a SaaS service by iextrading.com which is no longer publicly available.

Fetching "https://api.iextrading.com/1.0/stock/ibm/price" outside of the docs api shows this API no longer works.

"forbidden"

Steps to Reproduce the Problem

1. Make an api request to the sample rest-api-go example
2. recieve an "forbidden"
3. See: https://iextrading.com/developers/
   Phase I (Removed June 1, 2019) removed "Price"

[knative-housekeeping-robot]

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Mark the issue as fresh by adding the comment /remove-lifecycle stale.
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/lifecycle stale

[d2iq-shadowbq]

/remove-lifecycle stale

[abrennan89]

@markusthoemmes @mattmoor is there someone who can provided updates for these docs? Otherwise if the sample is outdated we should remove it.

[abrennan89]

(closed by accident, apologies!)

[mattmoor]

We should probably just remove this sample.