doc: move pstore.rst to usage/pstore.rst

Let's have a separate chapter dedicated to using U-Boot.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

doc/index.rst

@@ -25,6 +25,7 @@ trying to get it to work optimally on a given system.
    :maxdepth: 2
 
    build/index
+   usage/index
 
 Developer-oriented documentation
 --------------------------------
@@ -109,13 +110,6 @@ Android-specific features available in U-Boot.
 
    android/index
 
-Command line
-------------
-.. toctree::
-   :maxdepth: 2
-
-   pstore.rst
-
 Indices and tables
 ==================
 

doc/usage/index.rst

@@ -0,0 +1,12 @@
+Use U-Boot
+==========
+
+.. toctree::
+
+Shell commands
+--------------
+
+.. toctree::
+   :maxdepth: 1
+
+   pstore