docs: add header comments

Author: joe-p

examples/signing/01-ed25519-from-keyring.ts

@@ -1,5 +1,15 @@
-/* eslint-disable no-console */
+/**
+ * Example: Ed25519 Signing From Keyring
+ *
+ * This example demonstrates how to retrieve secrets from a keyring and use them to sign
+ * transactions.
+ *
+ * Prerequisites:
+ * - LocalNet running (via `algokit localnet start`)
+ * - OS that has keyring support
+ */
 
+/* eslint-disable no-console */
 import { ed25519SigningKeyFromWrappedSecret, WrappedEd25519Seed } from '@algorandfoundation/algokit-crypto'
 import { algo, AlgorandClient, microAlgo } from '@algorandfoundation/algokit-utils'
 import { mnemonicFromSeed, seedFromMnemonic } from '@algorandfoundation/algokit-utils/algo25'

examples/signing/02-hd-from-keyring.ts

@@ -1,4 +1,13 @@
-/* eslint-disable no-console */
+/**
+ * Example: HD Signing From Keyring
+ *
+ * This example demonstrates how to retrieve secrets from a keyring and use them to sign
+ * transactions.
+ *
+ * Prerequisites:
+ * - LocalNet running (via `algokit localnet start`)
+ * - OS that has keyring support
+ */
 
 import {
   ed25519SigningKeyFromWrappedSecret,

examples/signing/03-aws-kms.ts

@@ -1,3 +1,14 @@
+/**
+ * Example: Ed25519 Signing from AWS KMS
+ *
+ * This example demonstrates how to use the AWS KMS
+ *
+ * Prerequisites:
+ * - LocalNet running (via `algokit localnet start`)
+ */
+
+/* eslint-disable no-console */
+
 import { RawEd25519Signer } from '@algorandfoundation/algokit-crypto'
 import { AlgorandClient, microAlgos } from '@algorandfoundation/algokit-utils'
 import { generateAddressWithSigners } from '@algorandfoundation/algokit-utils/transact'