Update Set-OwaMailboxPolicy.md

Minor typo fix

Author: chrisda

exchange/exchange-ps/exchange/Set-OwaMailboxPolicy.md

@@ -1351,7 +1351,7 @@ Accept wildcard characters: False
 ### -NpsSurveysEnabled
 This parameter is available only in the cloud-based service.
 
-The NpsSurveysEnabled parameter specifies whether to enable or disable the Net Promoter Score (NPS) survey in Outlook on the web. The survey allows uses to rate Outlook on the web on a scale of 1 to 5, and to provide feedback and suggested improvements in free text. Valid values are:
+The NpsSurveysEnabled parameter specifies whether to enable or disable the Net Promoter Score (NPS) survey in Outlook on the web. The survey allows users to rate Outlook on the web on a scale of 1 to 5, and to provide feedback and suggested improvements in free text. Valid values are:
 
 - $true: The NPS survey is available in Outlook on the web. This is the default value.
 - $false: The NPS survey isn't available in Outlook on the web.