[doc] Use the same verilator command for tracing

The tracing example used --meminit, which used to initialize RAM. That's
now replaced by --rominit and --flashinit.

Signed-off-by: Philipp Wagner <phw@lowrisc.org>
diff --git a/doc/ug/getting_started_verilator.md b/doc/ug/getting_started_verilator.md
index 4c7182c..3b2a0d1 100644
--- a/doc/ug/getting_started_verilator.md
+++ b/doc/ug/getting_started_verilator.md
@@ -165,6 +165,9 @@
 
 ```console
 $ cd $REPO_TOP
-$ build/lowrisc_systems_top_earlgrey_verilator_0.1/sim-verilator/Vtop_earlgrey_verilator --meminit=sw/device/examples/hello_world/sw.vmem --trace
+$ build/lowrisc_systems_top_earlgrey_verilator_0.1/sim-verilator/Vtop_earlgrey_verilator \
+  --rominit=sw/device/sim_boot_rom/rom.vmem \
+  --flashinit=sw/device/sim_hello_world/sw.vmem \
+  --trace
 $ gtkwave sim.fst
 ```