Change section name

Author: gwangmu

mkdocs.yml

@@ -88,7 +88,7 @@ nav:
       - 'Release notes': software/uenv/release-notes.md
     - 'Container Engine': 
       - software/container-engine/index.md
-      - 'Using CE': software/container-engine/run.md
+      - 'Using container engine': software/container-engine/run.md
       - 'Resource and hooks': software/container-engine/resource-hook.md
       - 'EDF reference': software/container-engine/edf.md
       - 'Known issues': software/container-engine/known-issue.md