[skip ci] Modify script description (#9401)

Signed-off-by: Ngroot <yihua.mo@zilliz.com>

scripts/start_cluster.sh

 cd ..
 
-echo "starting rootcoord"
+echo "Starting rootcoord..."
 nohup ./bin/milvus run rootcoord > /tmp/rootcoord.log 2>&1 &
 
-echo "starting datacoord"
+echo "Starting datacoord..."
 nohup ./bin/milvus run datacoord > /tmp/datacoord.log 2>&1 &
 
-echo "starting datanode"
+echo "Starting datanode..."
 nohup ./bin/milvus run datanode > /tmp/datanode.log 2>&1 &
 
-echo "starting proxy"
+echo "Starting proxy..."
 nohup ./bin/milvus run proxy > /tmp/proxy.log 2>&1 &
 
-echo "starting querycoord"
+echo "Starting querycoord..."
 nohup ./bin/milvus run querycoord > /tmp/querycoord.log 2>&1 &
 
-echo "starting querynode"
+echo "Starting querynode..."
 nohup ./bin/milvus run querynode > /tmp/querynode.log 2>&1 &
 
-echo "starting indexcoord"
+echo "Starting indexcoord..."
 nohup ./bin/milvus run indexcoord > /tmp/indexcoord.log 2>&1 &
 
-echo "starting indexnode"
+echo "Starting indexnode..."
 nohup ./bin/milvus run indexnode > /tmp/indexnode.log 2>&1 &
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