doc: replace @return by Return:

Sphinx expects Return: and not @return to indicate a return value.

find . -name '*.c' -exec \
sed -i 's/^\(\s\)\*\(\s*\)@return\(\s\)/\1*\2Return:\3/' {} \;

find . -name '*.h' -exec \
sed -i 's/^\(\s\)\*\(\s*\)@return\(\s\)/\1*\2Return:\3/' {} \;

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>

lib/efi_selftest/efi_selftest_exception.c

@@ -63,7 +63,7 @@ static u8 *image;
  * Decompress the disk image.
  *
  * @image	decompressed disk image
- * @return	status code
+ * Return:	status code
  */
 static efi_status_t decompress(u8 **image)
 {