Fix documentation on overlay handling

Author: hach-que

docs/ossv1/presence/parties.mdx

@@ -10,7 +10,7 @@ Turning on presence parties allows players to join parties from the Epic Games O
 To enable **Join** and **Invite** functionality in the Epic Games Overlay for parties, make sure you set the `PresenceAdvertises` setting to `Party`, like so:
 
 ```ini
-[OnlineSubsystem] 
+[EpicOnlineServices]
 PresenceAdvertises=Party
 ```
 
@@ -22,4 +22,4 @@ When using parties with presence, all of the events are already handled for you.
 
 ## Specifying the presence party
 
-Only one party can be set as the "presence party" (that is, the one associated with the overlay). This is determined by the party having a type ID that matches the primary party type ID.
+Only one party can be set as the "presence party" (that is, the one associated with the overlay). This is determined by the party having a type ID that matches the primary party type ID.

docs/ossv1/presence/sessions.mdx

@@ -10,7 +10,7 @@ Turning on presence sessions allows players to join sessions from the Epic Games
 To enable **Join** and **Invite** functionality in the Epic Games Overlay for parties, make sure you set the `PresenceAdvertises` setting to `Session`, like so:
 
 ```ini
-[OnlineSubsystem] 
+[EpicOnlineServices]
 PresenceAdvertises=Session
 ```
 
@@ -22,4 +22,4 @@ The delegate handler for this event **must call JoinSession** (and once that suc
 
 ### Specifying the presence session
 
-Only one session can be set as the "presence session" (that is, the one associated with the overlay). This is determined by setting `bUsesPresence` when the session is created, and this setting is inherited on all clients that join the session.
+Only one session can be set as the "presence session" (that is, the one associated with the overlay). This is determined by setting `bUsesPresence` when the session is created, and this setting is inherited on all clients that join the session.