Fix class reference in Extensions section of docs #949
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ConfigurableEnvironmentInterface
appears to be a vestige of the 1.x branch.https://github.com/thephpleague/commonmark/blob/1.6/src/ConfigurableEnvironmentInterface.php
EnvironmentBuilderInterface
appears to be the corresponding interface used byExtensionInterface
in 2.x branches.https://github.com/thephpleague/commonmark/blob/2.3/src/Extension/ExtensionInterface.php#L19-L23
This issue appears to be present in the docs for all 2.x branches.