Update overview.md (#1741)

Author: Boby900

pages/sessions/overview.md

@@ -4,7 +4,7 @@ title: "Sessions"
 
 # Sessions
 
-Sessions are a way to persist state in the server. It is especially useful for managing the authentication state, such as the client's identity. We can assign each session with a unique ID and store it on the server to use it as a token. The client can then associate subsequent requests with a session, and by extension the user, by sending the its ID.
+Sessions are a way to persist state in the server. It is especially useful for managing the authentication state, such as the client's identity. We can assign each session with a unique ID and store it on the server to use it as a token. The client can then associate subsequent requests with a session, and by extension, with the user, by sending its ID.
 
 Session IDs can either be stored using cookies or local storage in browsers. We recommend using cookies since it provides some protection against XSS and the easiest to deal with overall.