Update transaction docs

src/pages/docs_sdk_transaction.html

@@ -1,12 +1,22 @@
 <div class="section">
   <h2><a href="/docs/#sdk">SDK</a> : Transaction</h2>
 
-  <pre>
-    <code class="language-javascript">userbase.transaction(databaseName, operations)
-  .then(() => {
+  <p><span class="font-semibold">Transaction</span> lets you submit multiple database operations as a single atomic batch. Either all operations succeed, or the entire batch fails. You will never see partial updates. This API will return a promise that gets resolved once the transaction has been fully applied and durably persisted in the database.</p>
 
-  })
-  .catch((e) => console.error(e))</code>
+  <pre>
+    <code class="language-javascript">
+    const operations = [
+      { command: 'Update', item: { todo: 'Item A' }, id: '0001' },
+      { command: 'Insert', item: { todo: 'Item B' }, id: '0002' },
+      { command: 'Delete', item: { todo: 'Item C' }, id: '0003' }
+    ]
+
+    userbase.transaction(databaseName, operations)
+      .then(() => {
+        // transaction applied
+      })
+    .catch((e) => console.error(e))
+    </code>
   </pre>
 
   <h3 id="params">Parameters</h3>
@@ -16,7 +26,7 @@
       <span class="field">databaseName</span> [string | Len: 1-50] - The database name to use.
     </li>
     <li>
-      <span class="field">operations</span> [Array] - The Insert, Update, or Delete operations to execute in an atomic transaction.
+      <span class="field">operations</span> [Array] - The Insert, Update, or Delete operations to execute as an atomic transaction.
     </li>
   </ul>