Fix minor typo (#1355)

cheatsheets/Securing_Cascading_Style_Sheets_Cheat_Sheet.md

@@ -8,7 +8,7 @@ Let's demonstrate this risk with an example:
 
 Santhosh is a programmer who works for a company called **X** and authors a Cascading Style Sheet to implement styling of the web application. The application for which he is writing CSS Code has various roles like **Student**, **Teacher**, **Super User** & **Administrator** and these roles have different permissions (PBAC - [Permission Based Access Control](Access_Control_Cheat_Sheet.md)) and Roles (RBAC - [Role Based Access Control](Access_Control_Cheat_Sheet.md)). Not only do these roles have different access controls, but these roles could also have different styling for webpages that might be specific to an individual or group of roles.
 
-Santhosh thinks that it would a great optimized idea to create a "global styling" CSS file which has all the CSS styling/selectors for all of the roles. According to their role, a specific feature or user interface element will be rendered. For instance, Administrator will have different features compared to **Student** or **Teacher** or **SuperUser**. However, some permissions or features maybe common to some roles.
+Santhosh thinks that it would be a great optimized idea to create a "global styling" CSS file which has all the CSS styling/selectors for all of the roles. According to their role, a specific feature or user interface element will be rendered. For instance, Administrator will have different features compared to **Student** or **Teacher** or **SuperUser**. However, some permissions or features maybe common to some roles.
 
 Example: Profile Settings will be applicable to all the users here while *Adding Users* or *Deleting Users* is only applicable for **Administrator**.