docs: clarify wording in subscriptions regarding starting positions

Author: w1am

docs/api/subscriptions.md

@@ -46,12 +46,12 @@ When you subscribe to a stream with link events (e.g., `$ce` category stream), s
 
 ## Subscribing from a Position
 
-Both stream and `$all` subscriptions accept a starting position if you want to read from a specific point onward. If events already exist at the position you subscribe to, they will be read on the server side and sent to the subscription.
+Both stream and `$all` subscriptions accept a starting position if you want to read from a specific point onward. If events already exist after the position you subscribe to, they will be read on the server side and sent to the subscription.
 
 Once caught up, the server will push any new events received on the streams to the client. There is no difference between catching up and live on the client side.
 
 ::: warning
-The positions provided to the subscriptions are exclusive. You will only receive the next event after the subscribed position.
+The positions provided to the subscriptions are **exclusive**. You will only receive the next event after the subscribed position.
 :::
 
 **Stream from specific position:**