minor symfony#26063 Fix misspelling variable (carusogabriel)

This PR was merged into the 2.7 branch.

Discussion
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Fix misspelling variable

| Q             | A
| ------------- | ---
| Branch?       | 2.7
| Bug fix?      | yes
| New feature?  | no <!-- don't forget to update src/**/CHANGELOG.md files -->
| BC breaks?    | no
| Deprecations? | no <!-- don't forget to update UPGRADE-*.md files -->
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Commits
-------

899ead2 Fix misspelling variable

Author: nicolas-grekas

src/Symfony/Component/HttpFoundation/Tests/RequestTest.php

@@ -1982,11 +1982,11 @@ public function testMethodSafeChecksCacheable()
     /**
      * @dataProvider methodCacheableProvider
      */
-    public function testMethodCacheable($method, $chacheable)
+    public function testMethodCacheable($method, $cacheable)
     {
         $request = new Request();
         $request->setMethod($method);
-        $this->assertEquals($chacheable, $request->isMethodCacheable());
+        $this->assertEquals($cacheable, $request->isMethodCacheable());
     }
 
     public function methodCacheableProvider()