docs(mercure): getOperation => get_operation

Author: soyuka

CHANGELOG.md

@@ -113,7 +113,7 @@ The v3.3.0-beta.1 introduces a new `QueryParameter` attribute to improve [the fi
 ### Features
 
 * [24a1a18cb](https://github.com/api-platform/core/commit/24a1a18cbe706c5a3bb4d5602b70c0a68ff8a757) feat: improve ApiProperty::security using property name (#5853)
-* [3d1428e4d](https://github.com/api-platform/core/commit/3d1428e4d2e4342918becf098da8832ac50fef1b) feat(symfony): add getOperation Expression Language function on Mercure topics (#5854)
+* [3d1428e4d](https://github.com/api-platform/core/commit/3d1428e4d2e4342918becf098da8832ac50fef1b) feat(symfony): add get_operation Expression Language function on Mercure topics (#5854)
 * [6b00cea91](https://github.com/api-platform/core/commit/6b00cea914dc5f9c42ca237a3ff498d629a0efb8) feat(graphql): partial pagination for page based pagination (#6120)
 * [79fe01b97](https://github.com/api-platform/core/commit/79fe01b970d90e3c80880f54fc0446b5294173f0) feat(doctrine): paginators for Doctrine Collection & Selectable (#6153)
 * [89c9229f4](https://github.com/api-platform/core/commit/89c9229f484cb409ef3eb2bd88cccc6ddc856378) feat(graphql): support nullable embedded relations in GraphQL types (#6100)
@@ -2286,4 +2286,4 @@ Please read #2825 if you have issues with the behavior of Readable/Writable Link
 ## 1.0.0 beta 2
 
 * Preserve indexes when normalizing and denormalizing associative arrays
-* Allow setting default order for property when registering a `Doctrine\Orm\Filter\OrderFilter` instance
+* Allow setting default order for property when registering a `Doctrine\Orm\Filter\OrderFilter` instance