media: ext-ctrls-jpeg.rst: cleanup V4L2_CID_JPEG_COMPRESSION_QUALITY text

The text is repeating the name of the control, which causes
it to be displayed outside the page with PDF output.

Besides that, this is the only JPEG control doing that. Removing
the name duplication doesn't affect the description, but, instead,
make it nicer.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

Documentation/userspace-api/media/v4l/ext-ctrls-jpeg.rst

@@ -64,13 +64,12 @@ JPEG Control IDs
 .. _jpeg-quality-control:
 
 ``V4L2_CID_JPEG_COMPRESSION_QUALITY (integer)``
-    ``V4L2_CID_JPEG_COMPRESSION_QUALITY`` control determines trade-off
-    between image quality and size. It provides simpler method for
-    applications to control image quality, without a need for direct
-    reconfiguration of luminance and chrominance quantization tables. In
-    cases where a driver uses quantization tables configured directly by
-    an application, using interfaces defined elsewhere,
-    ``V4L2_CID_JPEG_COMPRESSION_QUALITY`` control should be set by
+    Determines trade-off between image quality and size.
+    It provides simpler method for applications to control image quality,
+    without a need for direct reconfiguration of luminance and chrominance
+    quantization tables. In cases where a driver uses quantization tables
+    configured directly by an application, using interfaces defined
+    elsewhere, ``V4L2_CID_JPEG_COMPRESSION_QUALITY`` control should be set by
     driver to 0.
 
     The value range of this control is driver-specific. Only positive,