minor #6046 Update framework.rst (typo in sesssion) (patrick-mota)

This PR was submitted for the 3.0 branch but it was merged into the 2.3 branch instead (closes #6046).

Discussion
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Update framework.rst (typo in sesssion)

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | all
| Fixed tickets | no ticket open

Commits
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7ea3a62 Update framework.rst (typo in sesssion)

Author: wouterj

reference/configuration/framework.rst

@@ -733,7 +733,7 @@ cookie_lifetime
 **type**: ``integer`` **default**: ``null``
 
 This determines the lifetime of the session - in seconds. The default value
-- ``null`` - means that the ``sesssion.cookie_lifetime`` value from ``php.ini``
+- ``null`` - means that the ``session.cookie_lifetime`` value from ``php.ini``
 will be used. Setting this value to ``0`` means the cookie is valid for
 the length of the browser session.