Merge pull request #16530 from collinbrake:imread_unchanged_exif_doc

modules/imgcodecs/include/opencv2/imgcodecs.hpp

@@ -170,8 +170,9 @@ Currently, the following file formats are supported:
     then the [GDAL](http://www.gdal.org) driver will be used in order to decode the image, supporting
     the following formats: [Raster](http://www.gdal.org/formats_list.html),
     [Vector](http://www.gdal.org/ogr_formats.html).
--   If EXIF information are embedded in the image file, the EXIF orientation will be taken into account
-    and thus the image will be rotated accordingly except if the flag @ref IMREAD_IGNORE_ORIENTATION is passed.
+-   If EXIF information is embedded in the image file, the EXIF orientation will be taken into account
+    and thus the image will be rotated accordingly except if the flags @ref IMREAD_IGNORE_ORIENTATION
+    or @ref IMREAD_UNCHANGED are passed.
 -   By default number of pixels must be less than 2^30. Limit can be set using system
     variable OPENCV_IO_MAX_IMAGE_PIXELS