Merge pull request #124 from opencloud-eu/chore/branding-graph-service-svg

chore: adjust doc links in graph service readme svg file

services/graph/README.md

@@ -9,7 +9,7 @@ for a detailed specification of the API implemented by the graph service.
 
 The following image gives an overview of the scenario when a client requests to list available spaces the user has access to. To do so, the client is directed with his request automatically via the proxy service to the graph service.
 
-<img src="https://raw.githubusercontent.com/opencloud-eu/opencloud/master/services/graph/images/mermaid-graph.svg" width="500" />
+<img src="https://raw.githubusercontent.com/opencloud-eu/opencloud/main/services/graph/images/mermaid-graph.svg" width="500" />
 
 ## Users and Groups API
 
@@ -47,7 +47,7 @@ respect to the available schema:
     object class for groups.
   * The graph service maintains a few additional attributes for users and groups that are not
     available in the standard LDAP schema. An schema file, ready to use with OpenLDAP, defining those
-    additional attributes is available [here](https://github.com/opencloud-eu/opencloud/blob/master/deployments/examples/opencloud_ldap/config/ldap/schemas/10_owncloud_schema.ldif).
+    additional attributes is available [here](https://github.com/opencloud-eu/opencloud/blob/main/deployments/examples/opencloud_ldap/config/ldap/schemas/10_owncloud_schema.ldif).
 
 ## Query Filters Provided by the Graph API