docs: */index.rst: Add newer documents to their respective index.rst

A number of new docs were added, but they're currently not on
the index.rst from the session they're supposed to be, causing
Sphinx warnings.

Add them.

Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/Documentation/crypto/index.rst b/Documentation/crypto/index.rst
index 94c4786..c4ff5d7 100644
--- a/Documentation/crypto/index.rst
+++ b/Documentation/crypto/index.rst
@@ -20,5 +20,6 @@
    architecture
    devel-algos
    userspace-if
+   crypto_engine
    api
    api-samples
diff --git a/Documentation/driver-api/index.rst b/Documentation/driver-api/index.rst
index 6d8352c..3ac51c9 100644
--- a/Documentation/driver-api/index.rst
+++ b/Documentation/driver-api/index.rst
@@ -18,6 +18,7 @@
    infrastructure
    pm/index
    device-io
+   device_connection
    dma-buf
    device_link
    message-based
diff --git a/Documentation/process/index.rst b/Documentation/process/index.rst
index 1c9fe65..37bd062 100644
--- a/Documentation/process/index.rst
+++ b/Documentation/process/index.rst
@@ -52,6 +52,7 @@
    adding-syscalls
    magic-number
    volatile-considered-harmful
+   clang-format
 
 .. only::  subproject and html
 
diff --git a/Documentation/security/index.rst b/Documentation/security/index.rst
index 298a94a..85492bf 100644
--- a/Documentation/security/index.rst
+++ b/Documentation/security/index.rst
@@ -9,5 +9,7 @@
    IMA-templates
    keys/index
    LSM
+   LSM-sctp
+   SELinux-sctp
    self-protection
    tpm/index