Merge pull request #90 from waterlinked/wl-estensd-patch-5

Update mkdocs.yml

Author: thilo-huck

mkdocs.yml

@@ -171,6 +171,7 @@ nav:
 
   - I/O interface cards: 
       - Revision 4: io-interface-cards/io-interface-rev4.md
+      - Revision 6: io-interface-cards/io-interface-rev6.md
 
 
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