minor #4322 [Components][DependencyInjection] Correct a typo: replace "then" by "the" (fabschurt)

This PR was merged into the 2.3 branch.

Discussion
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[Components][DependencyInjection] Correct a typo: replace "then" by "the"

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | 2.3+
| Fixed tickets | n/a

Commits
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10776bb Correct a typo: replace "then" by "the".

Author: wouterj

components/dependency_injection/definitions.rst

@@ -40,7 +40,7 @@ Creating a new Definition
 ~~~~~~~~~~~~~~~~~~~~~~~~~
 
 If you need to create a new definition rather than manipulate one retrieved
-from then container then the definition class is :class:`Symfony\\Component\\DependencyInjection\\Definition`.
+from the container then the definition class is :class:`Symfony\\Component\\DependencyInjection\\Definition`.
 
 Class
 ~~~~~