Update known-issues.md

Fixing two more Acrolinx issues

Author: ShannonLeavitt

articles/communication-services/concepts/known-issues.md

@@ -105,8 +105,8 @@ If users decide to quickly turn video on/off while call is in `Connecting` state
 ##### Possible causes
 Under investigation.
 
-#### Enumerating/accessing devices for Safari on MacOS and iOS 
-If access to devices are granted, after some time, device permissions are reset. Safari on MacOS and on iOS does not keep permissions for very long time unless there is a stream acquired. The simplest way to work around this is to call DeviceManager.askDevicePermission() API before calling the device manager's device enumeration APIs (DeviceManager.getCameras(), DeviceManager.getSpeakers(), and DeviceManager.getMicrophones()). If the permissions are there, then user will not see anything, if not, it will re-prompt.
+#### Enumerating/accessing devices for Safari on macOS and iOS 
+If access to devices are granted, after some time, device permissions are reset. Safari on macOS and on iOS does not keep permissions for very long time unless there is a stream acquired. The simplest way to work around this is to call DeviceManager.askDevicePermission() API before calling the device manager's device enumeration APIs (DeviceManager.getCameras(), DeviceManager.getSpeakers(), and DeviceManager.getMicrophones()). If the permissions are there, then user will not see anything, if not, it will re-prompt.
 
 <br/>Devices affected: iPhone
 <br/>Client library: Calling (JavaScript)