minor #6286 [HttpFoundation] Fix typo for ParameterBag getters - 3.0 (rendler-denis)

This PR was merged into the 3.0 branch.

Discussion
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[HttpFoundation] Fix typo for ParameterBag getters - 3.0

[HttpFoundation] Fix typo for max number of arguments for ParameterBag getters for the 3.0 branch

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | 3.0
| Fixed tickets | ~

Commits
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c440050 [HttpFoundation] Fix typo for ParameterBag getters

Author: wouterj

components/http_foundation/introduction.rst

@@ -140,7 +140,7 @@ has some methods to filter the input values:
 :method:`Symfony\\Component\\HttpFoundation\\ParameterBag::filter`
     Filters the parameter by using the PHP :phpfunction:`filter_var` function.
 
-All getters takes up to three arguments: the first one is the parameter name
+All getters take up to two arguments: the first one is the parameter name
 and the second one is the default value to return if the parameter does not
 exist::