web: clarify some headings

web/src/components/SplBalances.tsx

@@ -36,7 +36,7 @@ function SplBalances() {
     ];
 
     return (<>
-            <h3>SPL Holdings</h3>
+            <h3>SPL Holdings on Solana</h3>
             <Table dataSource={t.balances} columns={columns} pagination={false} scroll={{y: 400}}/>
         </>
     )

web/src/components/TransferProposals.tsx

@@ -183,7 +183,7 @@ function TransferProposals() {
     ];
 
     return (<>
-            <h3>Pending transfers</h3>
+            <h3>Pending transfers to Ethereum</h3>
             <Table dataSource={lockups} columns={columns}/>
         </>
     )