Change some examples from json to jsonc (#649)

* Fix a copy-paste error.

* remove extra file

* Reformat json examples as jsonc

* Remove trailing angle bracket

Author: kmoscoe

api/python/v2/node.md

@@ -489,7 +489,7 @@ client.node.fetch_property_values(node_dcids=["country/USA"], properties="contai
 Response:
 {: .example-box-title}
 
-```
+```jsonc
 {
   "data": {
     "country/USA": {
@@ -528,7 +528,7 @@ Response:
               "dcid": "geoId/10",
               "name": "Delaware"
             },
-            ...
+            //...
         }
       }
     }
@@ -578,7 +578,7 @@ client.node.fetch_all_classes(all_pages=False)
 Response:
 {: .example-box-title}
 
-```
+```jsonc
 {
   "data": {
     "Class": {
@@ -657,7 +657,7 @@ Response:
                 "Class"
               ]
             },
-            ....
+            //...
           ]
         }
       }

api/rest/v2/index.md

@@ -272,11 +272,11 @@ curl --request GET \
 
 will return something like:
 
-```json
+```jsonc
 {
   "data": {
     "geoId/06": {
-      "arcs": < ... output truncated for brevity ...>
+      "arcs": // ... output truncated for brevity ...
     },
   },
   "nextToken": "SoME_veRy_L0ng_STrIng"

api/rest/v2/migration.md

@@ -570,7 +570,7 @@ $ curl --request GET --url \
 
 {% tab response V1 response %}
 
-```json
+```jsonc
 {
    "values" : [
       {
@@ -637,7 +637,7 @@ $ curl --request GET --url \
          "dcid" : "wikidataId/Q1195",
          "name" : "Meghalaya"
       },
-      <-- truncated -->
+      // -- truncated --
       {
          "dcid" : "wikidataId/Q677037",
          "name" : "Telangana"
@@ -648,7 +648,7 @@ $ curl --request GET --url \
 {% endtab %}
 {% tab response V2 response %}
 
-```json
+```jsonc
 {
    "data" : {
       "country/IND" : {
@@ -719,7 +719,7 @@ $ curl --request GET --url \
                      "dcid" : "wikidataId/Q1195",
                      "name" : "Meghalaya"
                   },
-                  <-- truncated -->
+                  //-- truncated --
                   {
                      "dcid" : "wikidataId/Q677037",
                      "name" : "Telangana"

api/rest/v2/observation.md

@@ -267,7 +267,6 @@ Response:
     "AmountOutstanding_Debt_PubliclyGuaranteed_LongTermExternalDebt_LenderCountryCHE": {
       "byEntity": {
         "country/TGO": {
-
         }
       }
     },

custom_dc/custom_entities.md

@@ -167,7 +167,7 @@ The other fields are explained in the [Data config file specification reference]
 
 Here's an example of the previous hospital data, covering both the entities and the statistical variables (we've left out the remaining 7 variables for brevity):
 
-```json
+```jsonc
 {
   "inputFiles": {
     "hospital_entities.csv": {
@@ -213,7 +213,7 @@ Here's an example of the previous hospital data, covering both the entities and
         "populationType": "Bed"
       }
     },
-    ...
+    //...
   },
   "sources": {
     "HHS Protect Public Data Hub": {