minor #18640 Add missing parenthesis in docblock description (j0k3r)

This PR was merged into the 2.8 branch.

Discussion
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Add missing parenthesis in docblock description

| Q             | A
| ------------- | ---
| Branch?       | 2.8
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        |

Commits
-------

199aa09 Add missing parenthesis in docblock description

src/Symfony/Component/Routing/RouteCollectionBuilder.php

@@ -170,7 +170,7 @@ public function setCondition($condition)
 
     /**
      * Sets a default value that will be added to all embedded routes (unless that
-     * default value is already set.
+     * default value is already set).
      *
      * @param string $key
      * @param mixed  $value
@@ -186,7 +186,7 @@ public function setDefault($key, $value)
 
     /**
      * Sets a requirement that will be added to all embedded routes (unless that
-     * requirement is already set.
+     * requirement is already set).
      *
      * @param string $key
      * @param mixed  $regex
@@ -202,7 +202,7 @@ public function setRequirement($key, $regex)
 
     /**
      * Sets an opiton that will be added to all embedded routes (unless that
-     * option is already set.
+     * option is already set).
      *
      * @param string $key
      * @param mixed  $value