update qhelp

Co-authored-by: Geoffrey White <40627776+geoffw0@users.noreply.github.com>

Author: karimhamdanali

swift/ql/src/queries/Security/ECB-Encryption/ECBEncryption.qhelp

@@ -12,7 +12,7 @@
   </recommendation>
 
   <example>
-    <p>The following example shows six cases of instantiating a cipher with various encryption keys and block modes. In the 'BAD' case, the mode of encryption is ECB, making the encrypted data vulnerable to replay attacks.  In the 'GOOD' cases, the encryption mode is CBC, which protects the encrypted data against replay attacks.</p>
+    <p>The following example shows six cases of instantiating a cipher with various encryption keys and block modes. In the 'BAD' cases, the mode of encryption is ECB, making the encrypted data vulnerable to replay attacks.  In the 'GOOD' cases, the encryption mode is CBC, which protects the encrypted data against replay attacks.</p>
     <sample src="ECBEncryption.swift" />
   </example>