fix(config): Deprecate capScreenshareBitrate.

config.js

         // simulcast is turned off for the desktop share. If presenter is turned
         // on while screensharing is in progress, the max bitrate is automatically
         // adjusted to 2.5 Mbps. This takes a value between 0 and 1 which determines
-        // the probability for this to be enabled.
-        // capScreenshareBitrate: 1 // 0 to disable
+        // the probability for this to be enabled. This setting has been deprecated.
+        // desktopSharingFrameRate.max now determines whether simulcast will be enabled
+        // or disabled for the screenshare.
+        // capScreenshareBitrate: 1 // 0 to disable - deprecated.
 
         // Enable callstats only for a percentage of users.
         // This takes a value between 0 and 100 which determines the probability for