user-management: update doc URL

The doc URL changed in the document repository as of
    I97d3360a0c5b15b2935a69c9a1537acd17b05b55

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I5f078fa6e5e62e8ce56cc28c08d2d552d0fb3208
diff --git a/xyz/openbmc_project/User/PrivilegeMapper.interface.yaml b/xyz/openbmc_project/User/PrivilegeMapper.interface.yaml
index ff9196e..87b2872 100644
--- a/xyz/openbmc_project/User/PrivilegeMapper.interface.yaml
+++ b/xyz/openbmc_project/User/PrivilegeMapper.interface.yaml
@@ -33,7 +33,7 @@
               xyz.openbmc_project.Common.Error.InvalidArgument exception will
               be thrown if the privilege is invalid. Additional documentation
               on privilege is available here.
-              https://github.com/openbmc/docs/blob/master/architecture/user_management.md
+              https://github.com/openbmc/docs/blob/master/architecture/user-management.md
       returns:
         - name: Path
           type: path