doc: west: apis: fix MalformedConfig autoclass

This was moved to west.configuration in v0.14.0. It happens to work in
the current API docs because the west.manifest module also imports
this class internally, but that's not where it's defined.

Signed-off-by: Martí Bolívar <[email protected]>

Author: mbolivar-nordic

doc/develop/west/west-apis.rst

@@ -484,10 +484,10 @@ Manifest and sub-objects
 Exceptions
 ==========
 
-.. autoclass:: west.manifest.MalformedManifest
+.. autoclass:: west.configuration.MalformedConfig
    :show-inheritance:
 
-.. autoclass:: west.manifest.MalformedConfig
+.. autoclass:: west.manifest.MalformedManifest
    :show-inheritance:
 
 .. autoclass:: west.manifest.ManifestVersionError