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* use var PHP_OPCACHE_MEMORY_CONSUMTION for configuration
Signed-off-by: Thomas Clavier <tom@tcweb.org>

* Use PHP_OPCACHE_MEMORY_CONSUMTION in Dockerfile-alpine.template
Signed-off-by: Thomas Clavier <tom@tcweb.org>

* fix typo : CONSUMTION -> CONSUMPTION

* Add opcache.memory_consumption documentation

* fix typo

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Signed-off-by: Thomas Clavier <tom@tcweb.org>