chagned some texts as needded

Author: sayantan1410

src/components/TabTraining.vue

@@ -6,7 +6,7 @@
       :label="deterministic.description"
       :saveKey="deterministic.name"
     />
-    <h2 class="training">Distributed Training (NCCL backend)</h2>
+    <h2 class="training">Distributed Training</h2>
     <FormCheckbox label="Use distributed training" saveKey="use_dist" />
     <div v-show="store.config.use_dist">
       <h2>Choose a Backend</h2>

src/metadata/metadata.json

@@ -46,7 +46,7 @@
       "name": "backend",
       "description":"Choose a Backend",
       "options":[
-        "NCCL Backend",
+        "NCCL",
         "XLA-TPU"
       ]
     }