docs: nfc: add it to the driver-api book

Most of the descriptions here are oriented to a Kernel developer.

Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
diff --git a/Documentation/driver-api/index.rst b/Documentation/driver-api/index.rst
index 7ecc650..d6bf4a3 100644
--- a/Documentation/driver-api/index.rst
+++ b/Documentation/driver-api/index.rst
@@ -56,6 +56,7 @@
    pinctl
    gpio/index
    misc_devices
+   nfc/index
    dmaengine/index
    slimbus
    soundwire/index
diff --git a/Documentation/nfc/index.rst b/Documentation/driver-api/nfc/index.rst
similarity index 92%
rename from Documentation/nfc/index.rst
rename to Documentation/driver-api/nfc/index.rst
index 4f4947f..3afb2c0 100644
--- a/Documentation/nfc/index.rst
+++ b/Documentation/driver-api/nfc/index.rst
@@ -1,5 +1,3 @@
-:orphan:
-
 ========================
 Near Field Communication
 ========================
diff --git a/Documentation/nfc/nfc-hci.rst b/Documentation/driver-api/nfc/nfc-hci.rst
similarity index 100%
rename from Documentation/nfc/nfc-hci.rst
rename to Documentation/driver-api/nfc/nfc-hci.rst
diff --git a/Documentation/nfc/nfc-pn544.rst b/Documentation/driver-api/nfc/nfc-pn544.rst
similarity index 100%
rename from Documentation/nfc/nfc-pn544.rst
rename to Documentation/driver-api/nfc/nfc-pn544.rst