doc: add include/lmb.h to the HTML documentation

Correct Sphinx style comments in include/lmb.h

Add the logical memory block API to the HTML documentation.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Acked-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
diff --git a/doc/api/lmb.rst b/doc/api/lmb.rst
new file mode 100644
index 0000000..2095bfa
--- /dev/null
+++ b/doc/api/lmb.rst
@@ -0,0 +1,7 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+Logical memory blocks
+=====================
+
+.. kernel-doc:: include/lmb.h
+   :internal: