Update SUPPORT.md

Co-authored-by: Paul Elliott <62069445+paul-elliott-arm@users.noreply.github.com>
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
diff --git a/SUPPORT.md b/SUPPORT.md
index 2ef5b54..8710d14 100644
--- a/SUPPORT.md
+++ b/SUPPORT.md
@@ -4,7 +4,7 @@
 
 - [ReadTheDocs](https://mbed-tls.readthedocs.io/);
 - API documentation, see the [Documentation section of the
-  README](README.md#License);
+  README](README.md#documentation);
 - the `docs` directory in the source tree;
 - the [Mbed TLS mailing-list
   archives](https://lists.trustedfirmware.org/archives/list/mbed-tls@lists.trustedfirmware.org/).