Fix links

Signed-off-by: Kévin Commaille <zecakeh@tedomum.fr>

Author: zecakeh

content/client-server-api/_index.md

@@ -439,7 +439,7 @@ endpoints it supports.
 Most API endpoints require the user to identify themselves by presenting
 previously obtained credentials in the form of an access token.
 An access token is typically obtained via the [Login](#login) or
-[Registration](#account-registration-and-management) processes. Access tokens
+[Registration](#account-registration) processes. Access tokens
 can expire; a new access token can be generated by using a refresh token.
 
 {{% boxes/note %}}
@@ -494,7 +494,7 @@ used to generate a new access token and refresh token, the new access
 and refresh tokens are now bound to the device associated with the
 initial refresh token.
 
-By default, the [Login](#login) and [Registration](#account-registration-and-management)
+By default, the [Login](#login) and [Registration](#account-registration)
 processes auto-generate a new `device_id`. A client is also free to
 generate its own `device_id` or, provided the user remains the same,
 reuse a device: in either case the client should pass the `device_id` in