Fix incorrect formatting for some javadoc (#283)

Fixing some javadoc badly formatted, having text diagram not in `<pre/>` for render.
Signed-off-by: Tristan Chuine <[email protected]>

Author: Tristan-WorkGH

src/test/java/org/gridsuite/modification/server/utils/NetworkCreation.java

@@ -270,16 +270,19 @@ public static Network createMixedTopology(UUID uuid) {
     }
 
     /**
-     *     VL1            VL2            VL3
+     * Create a network as following:
+     * <pre>
+     *     VL1            VL2             VL3
      *
      *     ld1            g2              ld3
      *      |              |               |
      *     br1            br2             br3
-     *      |             |                |
-     *     d1             d2               d3
+     *      |              |               |
+     *     d1             d2              d3
      *      |              |               |
      *     bbs1 ----------bbs2------------bbs3
-     *            l1             l2
+     *              l1             l2
+     * </pre>
      */
     public static Network createForDeleteVoltageLevelOnLine(UUID uuid) {
         Network network = new NetworkFactoryImpl().createNetwork(uuid.toString(), "NetworkForDeleteVoltageLevelOnLine");

src/test/java/org/gridsuite/modification/server/utils/NetworkWithTeePoint.java

@@ -29,27 +29,29 @@ public static Network create(UUID uuid) {
     }
 
     /**
-     *     VL1            VL2            VL3
+     * Create a network as following:
+     * <pre>
+     *     VL1            VL2             VL3
      *
      *     ld1            g2              ld3
      *      |              |               |
      *     br1            br2             br3
-     *      |             |                |
-     *     d1             d2               d3
+     *      |              |               |
+     *     d1             d2              d3
      *      |              |               |
      *     bbs1 ----------bbs2------------bbs3
-     *            l1       |       l2
+     *              l1     |       l2
      *                     | l3
      *                     |
      *                    bbs4         VL4
-     *                    |
+     *                     |
      *                    d4
-     *                    |
+     *                     |
      *                    br4
-     *                    |
+     *                     |
      *                    ld4
+     * </pre>
      */
-
     public static Network create(UUID uuid, NetworkFactory networkFactory) {
         Network network = networkFactory.createNetwork(uuid.toString(), "NetworkWithTeePoint");