minor #17409 [Doctrine] Update multiple_entity_managers.rst (ccattaneo)

This PR was submitted for the 6.1 branch but it was merged into the 6.2 branch instead.

Discussion
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[Doctrine] Update multiple_entity_managers.rst

in this symfony version the "annotation" type for mappings should be treated as deprecated, or at least reported with a comment

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Commits
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db393f5 Update multiple_entity_managers.rst

Author: javiereguiluz

doctrine/multiple_entity_managers.rst

@@ -43,7 +43,6 @@ The following configuration code shows how you can configure two entity managers
                         mappings:
                             Main:
                                 is_bundle: false
-                                type: annotation
                                 dir: '%kernel.project_dir%/src/Entity/Main'
                                 prefix: 'App\Entity\Main'
                                 alias: Main
@@ -52,7 +51,6 @@ The following configuration code shows how you can configure two entity managers
                         mappings:
                             Customer:
                                 is_bundle: false
-                                type: annotation
                                 dir: '%kernel.project_dir%/src/Entity/Customer'
                                 prefix: 'App\Entity\Customer'
                                 alias: Customer
@@ -85,7 +83,6 @@ The following configuration code shows how you can configure two entity managers
                         <doctrine:mapping
                             name="Main"
                             is_bundle="false"
-                            type="annotation"
                             dir="%kernel.project_dir%/src/Entity/Main"
                             prefix="App\Entity\Main"
                             alias="Main"
@@ -96,7 +93,6 @@ The following configuration code shows how you can configure two entity managers
                         <doctrine:mapping
                             name="Customer"
                             is_bundle="false"
-                            type="annotation"
                             dir="%kernel.project_dir%/src/Entity/Customer"
                             prefix="App\Entity\Customer"
                             alias="Customer"
@@ -127,15 +123,13 @@ The following configuration code shows how you can configure two entity managers
             $defaultEntityManager->connection('default');
             $defaultEntityManager->mapping('Main')
                 ->isBundle(false)
-                ->type('annotation')
                 ->dir('%kernel.project_dir%/src/Entity/Main')
                 ->prefix('App\Entity\Main')
                 ->alias('Main');
             $customerEntityManager = $doctrine->orm()->entityManager('customer');
             $customerEntityManager->connection('customer');
             $customerEntityManager->mapping('Customer')
                 ->isBundle(false)
-                ->type('annotation')
                 ->dir('%kernel.project_dir%/src/Entity/Customer')
                 ->prefix('App\Entity\Customer')
                 ->alias('Customer')