Update request_end instrumentation example (#1095)

* Update request_end instrumentation example in README.md
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Bart de Water 2022-10-14 19:40:20 -04:00 committed by GitHub
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@ -261,9 +261,13 @@ For example:
```ruby
Stripe::Instrumentation.subscribe(:request_end) do |request_event|
# Filter out high-cardinality ids from `path`
path_parts = event.path.split("/").drop(2)
resource = path_parts.map { |part| part.match?(/\A[a-z_]+\z/) ? part : ":id" }.join("/")
tags = {
method: request_event.method,
resource: request_event.path.split('/')[2],
resource: resource,
code: request_event.http_status,
retries: request_event.num_retries
}