Add new system: Fix doc

GitHub is rendering this as terrible looking red highlighted text. Fix
by making this correct JSON. It appears to be caused by some JSON
validation.

[1]: https://github.com/openbmc/docs/blob/44f3de929bbee0dbacd024b9724fe72817fd1f48/development/add-new-system.md?plain=1#L371

This was introduced years ago by
[2]: ace9cd1

The GitHub rendering engine could have changed in that time.

Now that this was correct syntax, prettier had an opinion.

Tested: Pushed to my fork and looks good.

Change-Id: Idddfb94269665640cd94c9d920a02c91953898e0
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>

Author: gtmills

development/add-new-system.md

@@ -345,30 +345,29 @@ Romulus.
 
 ```json
 {
-    "gpio_configs": {
-         "power_config": {
-            "power_good_in": "SYS_PWROK_BUFF",
-            "power_up_outs": [
-                { "name": "SOFTWARE_PGOOD", "polarity": true},
-                { "name": "BMC_POWER_UP", "polarity": true}
-            ],
-            "reset_outs": [
-            ]
-        }
+  "gpio_configs": {
+    "power_config": {
+      "power_good_in": "SYS_PWROK_BUFF",
+      "power_up_outs": [
+        { "name": "SOFTWARE_PGOOD", "polarity": true },
+        { "name": "BMC_POWER_UP", "polarity": true }
+      ],
+      "reset_outs": []
+    }
+  },
+
+  "gpio_definitions": [
+    {
+      "name": "SOFTWARE_PGOOD",
+      "pin": "R1",
+      "direction": "out"
     },
-
-     "gpio_definitions": [
-        {
-            "name": "SOFTWARE_PGOOD",
-            "pin": "R1",
-            "direction": "out"
-        },
-        {
-            "name": "BMC_POWER_UP",
-            "pin": "D1",
-            "direction": "out"
-        },
-    ...
+    {
+      "name": "BMC_POWER_UP",
+      "pin": "D1",
+      "direction": "out"
+    }
+  ]
 }
 ```