docs: kbuild: fix build with pdf and fix some minor issues

The tag ".. include" should be replaced by ".. literalinclude" at
issues.rst, otherwise it causes TeX to crash due to excessive usage
of stack with Sphinx 2.0.

While here, solve a few minor issues at the kbuild book output by
adding extra blank lines.

Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
diff --git a/Documentation/kbuild/kbuild.rst b/Documentation/kbuild/kbuild.rst
index b255489..ce9b99c 100644
--- a/Documentation/kbuild/kbuild.rst
+++ b/Documentation/kbuild/kbuild.rst
@@ -18,7 +18,7 @@
 by modprobe to not fail when trying to load something builtin.
 
 modules.builtin.modinfo
---------------------------------------------------
+-----------------------
 This file contains modinfo from all modules that are built into the kernel.
 Unlike modinfo of a separate module, all fields are prefixed with module name.
 
@@ -153,6 +153,7 @@
 The default name is "installkernel".
 
 The script will be called with the following arguments:
+
    - $1 - kernel version
    - $2 - kernel image file
    - $3 - kernel map file