libcamera: Remove extra ':' after '\todo'

The doxygen '\todo' directory doesn't need to be followed by a colon,
yet a few strayed occurrences have made their way in. Fix them.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>

src/ipa/ipu3/algorithms/agc.cpp

@@ -229,7 +229,7 @@ void Agc::computeExposure(IPAContext &context, IPAFrameContext *frameContext,
 
 	/*
 	 * Filter the exposure.
-	 * \todo: estimate if we need to desaturate
+	 * \todo estimate if we need to desaturate
 	 */
 	exposureValue = filterExposure(exposureValue);