video: kconfig: Fix wrong text for the PCI default FB size

There is an example in the VIDEO_PCI_DEFAULT_FB_SIZE help text to
tell people how to calculate its value but the resolution given
does not match the value. Fix it.

Signed-off-by: Bin Meng <bmeng@tinylab.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 3cdaa5f..43ec7e6 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -77,7 +77,7 @@
 	  devices to have a framebuffer allocated by U-Boot.
 
 	  Note: the framebuffer needs to be large enough to store all pixels at
-	  maximum resolution. For example, at 1920 x 1200 with 32 bits per
+	  maximum resolution. For example, at 2560 x 1600 with 32 bits per
 	  pixel, 2560 * 1600 * 32 / 8 = 0xfa0000 bytes are needed.
 
 config VIDEO_COPY
@@ -1049,7 +1049,7 @@
 	  devices to have a framebuffer allocated by U-Boot.
 
 	  Note: the framebuffer needs to be large enough to store all pixels at
-	  maximum resolution. For example, at 1920 x 1200 with 32 bits per
+	  maximum resolution. For example, at 2560 x 1600 with 32 bits per
 	  pixel, 2560 * 1600 * 32 / 8 = 0xfa0000 bytes are needed.
 
 config SPL_CONSOLE_SCROLL_LINES