[HttpKernel] Adding small example of how the extension alias is auto-generated
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@ -69,6 +69,17 @@ abstract class Extension implements ExtensionInterface
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*
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* This alias is also the mandatory prefix to use when using YAML.
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*
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* This convention is to remove the "Extension" postfix from the class
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* name and then lowercase and underscore the result. So:
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*
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* AcmeHelloExtension
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*
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* becomes
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*
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* acme_hello
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*
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* This can be overridden in a sub-class to specify the alias manually.
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*
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* @return string The alias
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*/
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public function getAlias()
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