fix typo (#258)

Author: macsual

docs/security/security-best-practices-for-cpp.md

@@ -44,7 +44,7 @@ This article contains information about security tools and practices. Using them
 ## SafeInt Library  
  [SafeInt Library](../windows/safeint-library.md) helps prevent integer overflows and other exploitable errors that might occur when the application performs mathematical operations. The `SafeInt` library includes the [SafeInt Class](../windows/safeint-class.md), the [SafeIntException Class](../windows/safeintexception-class.md), and several [SafeInt Functions](../windows/safeint-functions.md).  
 
- The `SafeInt` class protects against integer overflow and divide-by-zero exploits. You can use it to handle comparisons between values of different types. I provides two error handling policies. The default policy is for the `SafeInt` class to throw a `SafeIntException` class exception to report why a mathematical operation cannot be completed. The second policy is for the `SafeInt` class to stop program execution. You can also define a custom policy.  
+ The `SafeInt` class protects against integer overflow and divide-by-zero exploits. You can use it to handle comparisons between values of different types. It provides two error handling policies. The default policy is for the `SafeInt` class to throw a `SafeIntException` class exception to report why a mathematical operation cannot be completed. The second policy is for the `SafeInt` class to stop program execution. You can also define a custom policy.  
 
  Each `SafeInt` function protects one mathematical operation from an exploitable error. You can use two different kinds of parameters without converting them to the same type. To protect multiple mathematical operations, use the `SafeInt` class.