fix: proper display of go code in codingstyle doc (#4667)

CODINGSTYLE.md

@@ -189,18 +189,22 @@ Name tests with a compact name that reflects their scenario. Don't try to specif
 <thead><tr><th>Bad</th><th>Good</th></tr></thead>
 <tbody>
 <tr><td>
+
 ```go
 func TestSomethingBySettingVarToFive(t *testing.T) {
   ...
 }
 ```
+
 </td><td>
+
 ```go
 // TestSomething tests that something works correctly by doing this and that.
 func TestSomething(t *testing.T) {
   ...
 }
 ```
+
 </td>
 </td></tr>
 </tbody></table>