fixup! fixup! fixup! doc/guides: Add timer information to Porting Boards

Author: crasbe

doc/guides/advanced_tutorials/porting_boards.md

@@ -247,9 +247,9 @@ structure.
 ```c
 static const timer_conf_t timer_config[] = {
     {
-        ...
+        [...]
         .max      = 0x0000ffff,
-        ...
+        [...]
     }
 };
 
@@ -258,7 +258,8 @@ static const timer_conf_t timer_config[] = {
 
 :::caution
 `ztimer` does not automatically check if the `max` field and the
-`TIMER_0_MAX_VALUE` definition match!<br/>
+`TIMER_0_MAX_VALUE` definition match!
+
 For example: If you observe "erratic" blinking patterns in
 `examples/basic/blinky`, make sure to check if the sizes match.
 :::