media: Documentation: userspace-api/media: v4l/vidioc-g-ext-ctrls: drop doubled word

Drop the doubled word "controls".
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst

@@ -53,7 +53,7 @@ by the ``controls`` fields.
 To get the current value of a set of controls applications initialize
 the ``id``, ``size`` and ``reserved2`` fields of each struct
 :c:type:`v4l2_ext_control` and call the
-:ref:`VIDIOC_G_EXT_CTRLS <VIDIOC_G_EXT_CTRLS>` ioctl. String controls controls must also set the
+:ref:`VIDIOC_G_EXT_CTRLS <VIDIOC_G_EXT_CTRLS>` ioctl. String controls must also set the
 ``string`` field. Controls of compound types
 (``V4L2_CTRL_FLAG_HAS_PAYLOAD`` is set) must set the ``ptr`` field.