add missing paths config for mkdocstrings

docs/mkdocs/mkdocs.yml

diff --git a/docs/mkdocs/mkdocs.yml b/docs/mkdocs/mkdocs.yml
index ec1a9ae..3bade7b 100644
--- a/docs/mkdocs/mkdocs.yml
+++ b/docs/mkdocs/mkdocs.yml
@@ -65,7 +65,10 @@
   custom_dir: 'theme'
 
 plugins:
-  - mkdocstrings
+  - mkdocstrings:
+      handlers:
+        python:
+          paths: [../..]
 
 docs_dir: 'src'