Fix broken link to psa-driver-example-and-guide in psa-driver-wrappers-codegen-migration-guide.md

Fixes #8453

Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>
diff --git a/docs/proposed/psa-driver-wrappers-codegen-migration-guide.md b/docs/proposed/psa-driver-wrappers-codegen-migration-guide.md
index 8875921..f9b108d 100644
--- a/docs/proposed/psa-driver-wrappers-codegen-migration-guide.md
+++ b/docs/proposed/psa-driver-wrappers-codegen-migration-guide.md
@@ -4,7 +4,7 @@
 This document describes how to migrate to the auto generated psa_crypto_driver_wrappers.h file.
 It is meant to give the library user migration guidelines while the Mbed TLS project tides over multiple minor revs of version 1.0, after which this will be merged into psa-driver-interface.md.
 
-For a practical guide with a description of the current state of drivers Mbed TLS, see our [PSA Cryptoprocessor driver development examples](../psa-driver-example-and-guide.html).
+For a practical guide with a description of the current state of drivers Mbed TLS, see our [PSA Cryptoprocessor driver development examples](../psa-driver-example-and-guide.md).
 
 ## Introduction