docs: fix summary

Author: rsteube

docs/src/SUMMARY.md

@@ -11,7 +11,6 @@
   - [Choices](./choices.md)
   - [Completers](./completers.md)
   - [Style](./style.md)
-  - [Bridges](./bridges.md)
   - [Spec](./spec.md)
     - [User](./spec/user.md)
     - [Bridge](./spec/bridge.md)