CSP: Fix example description.

Author: kristijanburnik

specs/content-security-policy/index.src.html

@@ -3568,7 +3568,7 @@ <h3 id="example-policies">Sample Policy Definitions</h3>
     <h3 id="example-violation-report">Sample Violation Report</h3>
 
     This section contains an example violation report the user agent
-    might sent to a server when the protected resource violations a sample
+    might send to a server when the protected resource violates a sample
     policy.
 
     In the following example, the user agent rendered a representation