manual: fix formatting of cbmc output

Author: Daniel Kroening

doc/cprover-manual/properties.md

@@ -203,20 +203,22 @@ goto-instrument error_example.goto error_example_replaced.goto \
 cbmc error_example_replaced.goto
 ```
 
-Which gets us the output
-
-> ** Results:
-> error_example.c function api_error
-> [api_error.assertion.1] line 4 assertion false: FAILURE
->
-> error_example.c function internal_error
-> [internal_error.assertion.1] line 5 assertion false: FAILURE
->
-> ** 2 of 2 failed (2 iterations)
-> VERIFICATION FAILED
-
-As opposed to the verification success we would have seen without the
-instrumentation step.
+This generates the following output:
+
+```
+** Results:
+error_example.c function api_error
+[api_error.assertion.1] line 4 assertion false: FAILURE
+
+error_example.c function internal_error
+[internal_error.assertion.1] line 5 assertion false: FAILURE
+
+** 2 of 2 failed (2 iterations)
+VERIFICATION FAILED
+```
+
+Without the instrumentation step we would have seen
+"VERIFICATION SUCCESSFUL".
 
 The havoc option takes further parameters `globals` and `params` with this
 syntax: `havoc[,globals:<regex>][,params:<regex>]` (where the square brackets