minor #9032 Corrected recipies (abarke)

This PR was submitted for the master branch but it was merged into the 4.0 branch instead (closes #9032).

Discussion
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Corrected recipies

Incorrect aliases were given

Commits
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982e2c6 Corrected recipies

Author: javiereguiluz

setup/flex.rst

@@ -184,8 +184,8 @@ manual steps:
 
    .. code-block:: terminal
 
-       $ composer require annotations assets doctrine twig profiler \
-         logger mailer form fixtures security translation validator
+       $ composer require annotations asset doctrine twig profiler \
+         logger mailer form orm-fixtures security translation validator
 
 #. If the project's ``composer.json`` file doesn't contain ``symfony/symfony``
    dependency, it already defines its dependencies explicitly, as required by