minor symfony#3813 [Reference][Forms]fix time field count. (yositani2…

…002)

This PR was merged into the 2.3 branch.

Discussion
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[Reference][Forms]fix time field count.

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

Commits
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b2484eb fix field count.

reference/forms/types/time.rst

@@ -51,7 +51,7 @@ options are ``input`` and ``widget``.
 
 Suppose that you have a ``startTime`` field whose underlying time data is a
 ``DateTime`` object. The following configures the ``time`` type for that
-field as three different choice fields:
+field as two different choice fields:
 
 .. code-block:: php