docs: Fix case of Cypress readme file
Fix the case of the cypress readme to fix dead links in the docs.
Signed-off-by: David Brown <david.brown@linaro.org>
diff --git a/docs/index.md b/docs/index.md
index d8ec950..978be11 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -45,7 +45,7 @@
- [RIOT](readme-riot.md)
- [Mbed OS](readme-mbed.md)
- [Espressif](readme-espressif.md)
- - [Cypress/Infineon](../boot/cypress/readme.md)
+ - [Cypress/Infineon](../boot/cypress/README.md)
- [Simulator](../sim/README.rst)
- Testing
- [Zephyr](testplan-zephyr.md) - Zephyr test plan