chore: fix some typos (#2649)

Signed-off-by: renshuncui <renshun@111.com>
Co-authored-by: Ryan Lee <ryan@parity.io>

Author: renshuncui

README.md

@@ -63,7 +63,7 @@ For detailed API usage, refer to the [Substrate Connect API documentation](https
 ## Repository Structure
 
 ### [Packages](./packages/README.md)
-   The core implementations of `@subtrate/connect` and `@substrate/discovery`, and some auxiliary packages.
+   The core implementations of `@substrate/connect` and `@substrate/discovery`, and some auxiliary packages.
    - **[@substrate/discovery](./packages/discovery/)**
    - **[@substrate/connect](./packages/connect/)**
    - **[@substrate/connect-known-chains](./packages/connect-known-chains/)**

packages/README.md

@@ -14,7 +14,7 @@ The `@substrate/connect-known-chains` NPM package implements a list of well-know
 
 ## [`@substrate/discovery`](./discovery/README.md)
 
-The [`@substrate/discovery`](./discovery/README.md) NPM package allows developers to implement compliant extenstion discovery functionality into their application by using a predefined interface.
+The [`@substrate/discovery`](./discovery/README.md) NPM package allows developers to implement compliant extension discovery functionality into their application by using a predefined interface.
 
 [`@substrate/smoldot-discovery`](./smoldot-discovery/README.md) and [`@substrate/connect-discovery`](./connect-discovery/README.md) are an extension of [`@substrate/discovery`](./discovery/README.md) and allow to find and filter extension providers implementing smoldot and substrate-connect functionality respectively.
 

packages/light-client-extension-helpers/src/utils/createRpc.ts

@@ -75,7 +75,7 @@ export const createRpc = <TContext>(
       try {
         await methodHandler(message, context)
       } catch (error) {
-        console.error("error hanlding message:", message, error)
+        console.error("error handling message:", message, error)
       }
     } else if ("id" in message) {
       const { id } = message