[PATCH] Documentation: spi: fix SPDX directive formatting

[Diogo Pimenta]

Add a blank line after the SPDX directive to satisfy
reStructuredText parsing requirements and avoid
documentation build warnings reported by the kernel
test robot.

Reported-by: kernel test robot <lkp@xxxxxxxxx>
Closes: https://lore.kernel.org/oe-kbuild-all/202606111027.TFnhhj2n-lkp@xxxxxxxxx/

Signed-off-by: Diogo Pimenta <diogo2003.pimenta@xxxxxxxxx>
---
 Documentation/spi/spi-summary.rst | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/spi/spi-summary.rst b/Documentation/spi/spi-summary.rst
index 23e07ba4f8cc..c6bbbd9bce9f 100644
--- a/Documentation/spi/spi-summary.rst
+++ b/Documentation/spi/spi-summary.rst
@@ -1,4 +1,5 @@
 .. SPDX-License-Identifier: GPL-2.0-only
+
 ====================================
 Overview of Linux kernel SPI support
 ====================================
-- 
2.53.0