docs: add SPDX tags to new index files
All those new files I added are under GPL v2.0 license.
Add the corresponding SPDX headers to them.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
diff --git a/Documentation/driver-api/mmc/index.rst b/Documentation/driver-api/mmc/index.rst
index 9aaf649..7339736 100644
--- a/Documentation/driver-api/mmc/index.rst
+++ b/Documentation/driver-api/mmc/index.rst
@@ -1,3 +1,5 @@
+.. SPDX-License-Identifier: GPL-2.0
+
========================
MMC/SD/SDIO card support
========================
