partial_config_flow: fix readme bad commands

Signed-off-by: John McMaster <johndmcmaster@gmail.com>

minitests/partial_reconfig_flow/README.md

diff --git a/minitests/partial_reconfig_flow/README.md b/minitests/partial_reconfig_flow/README.md
index 8eac3df..4de4d03 100644
--- a/minitests/partial_reconfig_flow/README.md
+++ b/minitests/partial_reconfig_flow/README.md
@@ -37,8 +37,8 @@
 harness, load your synthesized design, and generate a bitstream containing
 both:
 ```
-open_checkpoint -force harness_routed.dcp
-read_checkpoint -cell <design>.dcp
+open_checkpoint harness_routed.dcp
+read_checkpoint -cell roi <design>.dcp
 opt_design
 place_design
 route_design