index.md: fix readme-espressif.md link
@@ -44,7 +44,7 @@ The MCUboot documentation is composed of the following pages:
- [Apache NuttX](readme-nuttx.md)
- [RIOT](readme-riot.md)
- [Mbed OS](readme-mbed.md)
- - [Espressif](docs/readme-espressif.md)
+ - [Espressif](readme-espressif.md)
- [Cypress/Infineon](../boot/cypress/readme.md)
- [Simulator](../sim/README.rst)
- Testing
