doc: add clarity to what a "fpga" image is
Update fit documentation to clarify that FPGA images are vendor specific and opaque bitstreams.
Signed-off-by: Sam Povilus <sam.povilus@amd.com>
diff --git a/doc/usage/fit/source_file_format.rst b/doc/usage/fit/source_file_format.rst
index 310225d..7727ab7 100644
--- a/doc/usage/fit/source_file_format.rst
+++ b/doc/usage/fit/source_file_format.rst
@@ -198,7 +198,7 @@
firmware Firmware
firmware_ivt Firmware with HABv4 IVT
flat_dt Flat Device Tree
- fpga FPGA Image
+ fpga FPGA Device Image (bitstream file, vendor specific)
gpimage TI Keystone SPL Image
imx8image NXP i.MX8 Boot Image
imx8mimage NXP i.MX8M Boot Image