Adding installation instructions for Symfony

by @ThomasLandauer

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Review the proposed patch then download it to apply it manually or execute the following command from the repository root directory:

curl https://fabbot.io/patch/twigphp/Twig/3744/5280bbf80a5873105a7ff65b22444f5e8b37edab/typos.diff | patch -p0
diff -ru CHANGELOG CHANGELOG
--- CHANGELOG	2022-09-28 06:38:02.607215382 +0000
+++ CHANGELOG	2022-09-28 06:38:09.619551742 +0000
@@ -141,7 +141,7 @@
  * removed Parser::isReservedMacroName()
  * removed SanboxedPrintNode
  * removed Node::setTemplateName()
- * made classes maked as "@final" final
+ * made classes marked, made as "@final" final
  * removed InitRuntimeInterface, ExistsLoaderInterface, and SourceContextLoaderInterface
  * removed the "spaceless" tag
  * removed Twig\Environment::getBaseTemplateClass() and Twig\Environment::setBaseTemplateClass()

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Usage of void in test files

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Use ::class whenever possible

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