Use mbedtls-2.28 branch for documentation link
Signed-off-by: Werner Lewis <werner.lewis@arm.com>
diff --git a/docs/3.0-migration-guide.md b/docs/3.0-migration-guide.md
index 14c8aa8..86bf36e 100644
--- a/docs/3.0-migration-guide.md
+++ b/docs/3.0-migration-guide.md
@@ -27,7 +27,7 @@
It's best to use the latest version of Mbed TLS 2.x for this purpose, which is the 2.28 LTS release.
So to generate the documentation, checkout the `mbedtls-2.28` branch and follow
-the instructions in the [Documentation section of the README](https://github.com/Mbed-TLS/mbedtls/blob/development/README.md#documentation).
+the instructions in the [Documentation section of the README](https://github.com/Mbed-TLS/mbedtls/blob/mbedtls-2.28/README.md#documentation).
Then browse `apidoc/deprecated.html` for guidance on upgrading deprecated code.
For some deprecated functions, 2.x documentation will suggest using a variant