📝 Refresh six classic guides

docs/data/horizon/api-reference/retrieve-an-order-book.api.mdx

@@ -1,7 +1,7 @@
 ---
 id: retrieve-an-order-book
 title: "Retrieve an Order Book"
-description: "The order book endpoint provides an order book's bids and asks and can be used in [streaming](https://developers.stellar.org/docs/data/horizon/api-reference/structure/streaming) mode."
+description: "The order book endpoint provides an order book's bids and asks and can be used in streaming mode."
 sidebar_label: "Retrieve an Order Book"
 hide_title: true
 hide_table_of_contents: true

docs/learn/fundamentals/stellar-data-structures/accounts.mdx

@@ -33,10 +33,13 @@ A base reserve is a unit of measurement used to calculate an account’s minimum
 
 Account data is stored in subentries, each of which increases an account’s minimum balance by one base reserve (0.5 XLM). An account cannot have more than 1,000 subentries. Possible subentries are:
 
-- Trustlines (includes traditional assets and pool shares)
+- Trustlines
+  - Includes traditional assets and pool shares
 - Offers
 - Additional signers
-- Data entries (includes data made with the `manageData` operation, not smart contract ledger entries)
+- Data entries
+  - Includes data made with the `manageData` operation
+  - Does not include smart contract ledger entries
 
 ## Trustlines
 

docs/learn/glossary.mdx

@@ -29,6 +29,10 @@ Fiat, physical, or other tokens of value that are tracked, held, or transferred
 
 See the [Assets section](./fundamentals/stellar-data-structures/assets.mdx) to learn more.
 
+### Atomic Swap
+
+An atomic swap is a decentralized method of exchanging one asset for another without the need for a trusted third-party intermediary. The process ensures that the interchange will either be completed fully by both parties or not at all—hence the term “atomic,” meaning indivisible. If one party fails to fulfill the required conditions, the trade is automatically canceled, and both parties retain their assets.
+
 ### Balance
 
 The amount of a given asset an account holds. Each asset has its own balance and these balances are stored in trustlines for every asset except XLM, which is held directly by the account.
@@ -87,7 +91,7 @@ A payment that automatically handles the conversion of dissimilar assets.
 
 ### Decentralized exchange
 
-A distributed exchange that allows the trading and conversion of assets on the network.
+A distributed exchange that allows the trading and conversion of assets on the network through atomic swaps.
 
 Learn more in our [Liquidity on Stellar](./encyclopedia/sdex/liquidity-on-stellar-sdex-liquidity-pools.mdx#sdex) Encyclopedia Entry.
 
@@ -263,12 +267,16 @@ The smart contract platform on the Stellar network. The name "Soroban" comes fro
 
 ### Source account
 
-The account that originates a transaction. This account also provides the fee and sequence number for the transaction.
+The account from which assets are consumed.
 
 ### Starlight
 
 Stellar’s layer 2 protocol that allows for bi-directional payment channels.
 
+See the [initial release](https://github.com/stellar-deprecated/starlight), [design considerations](https://youtu.be/LI_M6rWPCgQ), and [implimentation details](https://stellar.org/blog/developers/starlight-a-layer-2-payment-channel-protocol-for-stellar).
+
+Starlight relies on [CAP-21](https://github.com/stellar/stellar-protocol/blob/master/core/cap-0021.md) and [CAP-40](https://github.com/stellar/stellar-protocol/blob/master/core/cap-0040.md), both of which were introduced in [Protocol 19](https://stellar.org/blog/developers/protocol-19-upgrade-guide).
+
 ### Stellar
 
 A decentralized, federated peer-to-peer network that allows people to send payments in any asset anywhere in the world instantaneously, and with minimal fees.
@@ -325,7 +333,7 @@ Read more in the [Operations and Transactions section](./fundamentals/transactio
 
 ### Transaction envelope
 
-A wrapper for a transaction that carries signatures.
+A transaction plus its signature(s) is called a transaction envelope.
 
 ### Transaction fee
 

src/components/YouTube.js

@@ -0,0 +1,34 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+
+const YouTube = ({ ID }) => (
+  <div style={{
+    position: "relative",
+    width: "100%",
+    paddingBottom: "56.25%", // Make 16 x 9
+    height: 0,
+    marginBottom: "23px"
+  }}>
+    <iframe
+      src={`https://www.youtube-nocookie.com/embed/${ID}?controls=0`}
+      title="Informational explainer"
+      frameBorder="0"
+      allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture"
+      allowFullScreen
+      style={{
+        position: "absolute",
+        top: 0,
+        left: 0,
+        width: "100%",
+        height: "100%",
+        borderRadius: "25pt"
+      }}
+    ></iframe>
+  </div>
+);
+
+YouTube.propTypes = {
+  ID: PropTypes.string.isRequired,
+};
+
+export default YouTube;