Removed an internal detail about route placeholders #9519
Merged
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I propose to remove this because it's an internal detail and it only adds "cognitive noise" to the reader. Symfony will show you fantastic error messages (see https://github.com/symfony/symfony/blob/ecb629a24599e9c1ec34f34dae5cfd1a0f7986b4/src/Symfony/Component/Routing/RouteCompiler.php#L131-L142) if you make any of these mistakes.