Remove documentation re INSTANCE_NAME env var

This should have been included in #2315 when we stopped using INSTANCE_NAME anywhere in the app.
alphagov · Aug 23, 2023 · ee23540 · ee23540
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commit ee23540
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diff --git a/docs/environment-variables.md b/docs/environment-variables.md
@@ -40,10 +40,6 @@ Used to configure `GovukAdminTemplate` and in `Healthcheck::ApiTokens#expiring_t
 
 * `GOVUK_ENVIRONMENT_NAME`
 
-Used in various bits of logic to detect the production instance of the app and used to display various environment-specific strings.
-
-* `INSTANCE_NAME`
-
 ## Splunk
 
 Used to stream event logs to Splunk for analysis of Signon usage patterns and anomalies.