docs: improve texts

Author: nktkas

README.md

@@ -704,6 +704,13 @@ class WebSocketTransport {
 }
 ```
 
+### Errors
+
+- [`HyperliquidError`](src/errors.ts#L2) - Base error class for all SDK errors.
+- [`TransportError`](src/transports/base.ts#L49) - Thrown when a transport layer error occurs.
+- [`ApiRequestError`](src/clients//exchange.ts#L294) - Thrown when an API request fails.
+- [`SchemaError`](src/schemas/mod.ts#L79) - Thrown when a schema validation error occurs.
+
 ## Additional Import Points
 
 ### `/schemas`

src/schemas/mod.ts

@@ -5,7 +5,7 @@
  * ```ts
  * import { OrderRequest, parser } from "@nktkas/hyperliquid/schemas";
  * //       ^^^^^^^^^^^^
- * //       both a Valibot schema and a TypeScript type
+ * //       both a valibot schema and a typescript type
  *
  * const action = {
  *   type: "order",
@@ -21,7 +21,7 @@
  * } satisfies OrderRequest["action"]; // can be used as type
  *
  * //                             or as valibot schema
- * //                             ⌄⌄⌄⌄⌄⌄⌄⌄⌄⌄⌄
+ * //                             ⌄⌄⌄⌄⌄⌄⌄⌄⌄⌄⌄⌄
  * const validatedAction = parser(OrderRequest.entries.action)(action);
  * //                      ^^^^^^
  * //                      validates, formats, sorts object keys for correct signature generation

src/transports/base.ts

@@ -45,7 +45,7 @@ export interface Subscription {
     resubscribeSignal?: AbortSignal;
 }
 
-/** Thrown when a transport error occurs. */
+/** Thrown when a transport layer error occurs. */
 export class TransportError extends HyperliquidError {
     constructor(message?: string, options?: ErrorOptions) {
         super(message, options);