Merge pull request #2262 from ably/feature/REA-1868-cursors-batching

Change the description of outboundBatchInterval to reflect last Spaces SDK changes

content/spaces/cursors.textile

@@ -113,7 +113,7 @@ The following cursor options can be set:
 
 h3(#batch). outboundBatchInterval
 
-The @outboundBatchInterval@ is the interval at which a batch of cursor positions are published, in milliseconds, for each client. This is multiplied by the number of members in a space.
+The @outboundBatchInterval@ is the interval at which a batch of cursor positions are published, in milliseconds, for each client. This interval increases as the number of members in a space grows, adjusting based on groups of 100 members.
 
 The default value is 25ms which is optimal for the majority of use cases. If you wish to optimize the interval further, then decreasing the value will improve performance by further 'smoothing' the movement of cursors at the cost of increasing the number of events sent. Be aware that at a certain point the rate at which a browser is able to render the changes will impact optimizations.