Update plantuml 10_wiiu example

There was an issue caused by the alias `rom` being used for two separate elements. Fixed by renaming the second element to `prom`.

Another issue was that all arrows were `--` which means up/down to PlantUML. This was fixed by changing some arrows to `-` (meaning left/right).

Finally, some arrows were made longer (`---`) to give elements more space to be pointed to. This avoids links crossing.

Author: Potherca

src/examples/10_wiiu/syntax/plantuml.puml

@@ -7,7 +7,7 @@ node "IBM "Espresso" CPU" as ibm {
 
   [16 KB ROM] as rom
 
-  core0 -- core2
+  core2 - core0
 
   rom -> core2
 }
@@ -16,7 +16,7 @@ node "AMD "Latte" GPU" as amd {
   [Memory & I/O Bridge] as mem
   [DRAM Controller] as dram
   [32 MB EDRAM "MEM1"] as edram
-  [512 B SEEPROM] as rom
+  [512 B SEEPROM] as prom
 
   [SATA IF] as sata
   [EXI] as exi
@@ -30,22 +30,22 @@ node "AMD "Latte" GPU" as amd {
   mem -- gx
   mem -- radeon
 
-  rom -- mem
+  prom -- mem
 
-  mem -- sata
-  mem -- exi
+  mem --- sata
+  mem ---- exi
 
   dram -- sata
   dram -- exi
 }
 
 [2 GB DDR3 RAM "MEM2"] as ddr3
 
-mem -- ddr3
+mem -u- ddr3
 dram -- ddr3
 edram -- ddr3
 
-core1 -- mem
+core1 --- mem
 
 exi -- RTC