Merge branch '5.1' into master

* 5.1:
  Enhancement: Add Github error formatter for DOCtor-RST
  [DI] replace tagged by tagged_iterator

Author: OskarStark

.github/workflows/ci.yaml

@@ -68,4 +68,4 @@ jobs:
             -   name: "Run DOCtor-RST"
                 uses: docker://oskarstark/doctor-rst
                 with:
-                    args: --short --cache-file=/github/workspace/.cache/doctor-rst.cache
+                    args: --short --error-format=github --cache-file=/github/workspace/.cache/doctor-rst.cache

service_container/tags.rst

@@ -677,7 +677,7 @@ in the configuration of the collecting service:
                 https://symfony.com/schema/dic/services/services-1.0.xsd">
             <services>
                 <service id="App\HandlerCollection">
-                    <argument type="tagged" tag="app.handler" default-priority-method="getPriority"/>
+                    <argument type="tagged_iterator" tag="app.handler" default-priority-method="getPriority"/>
                 </service>
             </services>
         </container>
@@ -706,7 +706,7 @@ Tagged Services with Index
 
 If you want to retrieve a specific service within the injected collection
 you can use the ``index_by`` and ``default_index_method`` options of the
-argument in combination with ``!tagged``.
+argument in combination with ``!tagged_iterator``.
 
 Using the previous example, this service configuration creates a collection
 indexed by the ``key`` attribute: