Hotfix: Changing intercom to appId (to reflect docs.json spec) (#567)

* Changing intercom to appId to reflect docs.json

* quick edit to add back intercom

Author: dino475

integrations/support/intercom.mdx

@@ -8,13 +8,17 @@ Add the following to your `docs.json` file to add an [Intercom](https://www.inte
 
 ```json Integration options in docs.json
 "integrations": {
-    "intercom": "APP_ID"
+      "intercom": {
+            "appId": "APP_ID"
+      }
 }
 ```
 
 ```json Example
 "integrations": {
-    "intercom": "x2pg8cwb"
+      "intercom": {
+            "appId": "APP_ID"
+      }
 }
 ```