[Documentation] Fix format in table
@@ -11,7 +11,7 @@ In this part, we will introduce the hierarchy, dependency and functionality of e
| Full | Long | Random Stimuli | Full fabric |
+-----------------+---------+----------------+---------------+
| Formal-oriented | Short | Random Stimuli | Programmable |
-| | | or | fabric only |
+| | | | fabric only |
| | | Formal Method | |
+-----------------+---------+----------------+---------------+
