dev-docs(session): Lightly clarify some sentences related to Session envelopes (#14357)

Author: ryan953

develop-docs/sdk/telemetry/sessions/index.mdx

@@ -264,15 +264,15 @@ deduplicate the total session count as an optimization. If the initial
 
 ### Terminal Session States
 
-A session can exist in two states: in progress or terminated. A terminated
+A session can exist in one of two states: in progress or terminated. A terminated
 session must not receive further updates. `exited`, `crashed` and `abnormal`
 are all terminal states. When a session reaches this state the client must
 not report any more session updates or start a new session.
 
 SDKs are encouraged to distinguish between different ways of ending a session:
 
-- `exited`: this means the session ended cleanly. It's in no way different than
-  the session staying in `ok` from the point of success reports. However only
+- `exited`: this means the session ended cleanly. It's is the same as the 
+  session staying in `ok` from the point of success reports. However only
   sessions ending in `exited` will be considered for session durations.
   A session is allowed to go to `exited` even if errors occurred.