minor #17023 [DependencyInjection] add missing linter exception (jrushlow)

This PR was merged into the 5.4 branch.

Discussion
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[DependencyInjection] add missing linter exception

Referenced in https://github.com/symfony/symfony-docs/blob/5.4/service_container/alias_private.rst line 390

Commits
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7be6387 [DI] add missing linter exception

Author: javiereguiluz

.doctor-rst.yaml

@@ -91,6 +91,7 @@ whitelist:
         - '.. versionadded:: 1.8' # MakerBundle
         - '.. versionadded:: 1.18' # Flex in setup/upgrade_minor.rst
         - '.. versionadded:: 1.0.0' # Encore
+        - '.. versionadded:: 5.1' # Private Services
         - '0 => 123' # assertion for var_dumper - components/var_dumper.rst
         - '1 => "foo"' # assertion for var_dumper - components/var_dumper.rst
         - '123,' # assertion for var_dumper - components/var_dumper.rst