Fix the example file content for relation extraction

backend/data_import/pipeline/examples/relation_extraction/example.jsonl

@@ -1,46 +1 @@
-{
-    "text": "Google was founded on September 4, 1998, by Larry Page and Sergey Brin.",
-    "entities": [
-        {
-            "id": 0,
-            "start_offset": 0,
-            "end_offset": 6,
-            "label": "ORG"
-        },
-        {
-            "id": 1,
-            "start_offset": 22,
-            "end_offset": 39,
-            "label": "DATE"
-        },
-        {
-            "id": 2,
-            "start_offset": 44,
-            "end_offset": 54,
-            "label": "PERSON"
-        },
-        {
-            "id": 3,
-            "start_offset": 59,
-            "end_offset": 70,
-            "label": "PERSON"
-        }
-    ],
-    "relations": [
-        {
-            "from_id": 0,
-            "to_id": 1,
-            "type": "foundedAt"
-        },
-        {
-            "from_id": 0,
-            "to_id": 2,
-            "type": "foundedBy"
-        },
-        {
-            "from_id": 0,
-            "to_id": 3,
-            "type": "foundedBy"
-        }
-    ]
-}
+{"text":"Google was founded on September 4, 1998, by Larry Page and Sergey Brin.","entities":[{"id":0,"start_offset":0,"end_offset":6,"label":"ORG"},{"id":1,"start_offset":22,"end_offset":39,"label":"DATE"},{"id":2,"start_offset":44,"end_offset":54,"label":"PERSON"},{"id":3,"start_offset":59,"end_offset":70,"label":"PERSON"}],"relations":[{"from_id":0,"to_id":1,"type":"foundedAt"},{"from_id":0,"to_id":2,"type":"foundedBy"},{"from_id":0,"to_id":3,"type":"foundedBy"}]}

frontend/pages/projects/_id/dataset/import.vue

@@ -47,6 +47,16 @@
       >
         <pre>{{ example }}</pre>
       </v-sheet>
+      <div v-if="selected==='JSONL(Relation)'">
+        <p class="body-1">For readability, the above format can be displayed as follows:</p>
+        <v-sheet
+          :dark="!$vuetify.theme.dark"
+          :light="$vuetify.theme.dark"
+          class="mb-5 pa-5"
+        >
+          <pre>{{ JSON.stringify(JSON.parse(example.replaceAll("'", '"')), null, 4) }}</pre>
+        </v-sheet>
+      </div>
       <file-pond
         v-if="selected && acceptedFileTypes !== '*'"
         ref="pond"