fixup

Author: VeskeR

content/api/realtime-sdk/presence.textile

@@ -87,7 +87,7 @@ blang[jsall].
   bq(definition#enter-data).
     jsall: enter(Object data?): Promise<void>
 
-  Enter a presence channel with an optional data that is associated with the current present member. If the channel is @initialized@ (i.e. no attempt to attach has yet been made for this channel), then calling @enter@ will implicitly attach the channel.
+  Enter a presence channel with optional data that is associated with the current present member. If the channel is @initialized@ (i.e. no attempt to attach has yet been made for this channel), then calling @enter@ will implicitly attach the channel.
 
 h4. Parameters