Correct headless license reference

Author: johnthagen

LICENSE-3RD-PARTY.txt

@@ -81,7 +81,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
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 FFmpeg is redistributed within all opencv-python packages.
-Qt 4.8.7 is redistributed within opencv-python Linux packages.
+Qt 4.8.7 is redistributed within non-headless opencv-python Linux packages.
 This license applies to FFmpeg and Qt binaries in the directory cv2/.
 
                   GNU LESSER GENERAL PUBLIC LICENSE
@@ -588,7 +588,7 @@ necessary.  Here is a sample; alter the names:
 That's all there is to it!
 
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-Qt 5 is redistributed within opencv-python macOS packages.
+Qt 5 is redistributed within non-headless opencv-python macOS packages.
 This license applies to Qt binaries in the directory cv2/.
 
                    GNU LESSER GENERAL PUBLIC LICENSE