CPP: Fix typo.

Author: geoffw0

cpp/ql/src/Likely Bugs/Protocols/UseOfDeprecatedHardcodedProtocol.qhelp

@@ -4,7 +4,7 @@
 <qhelp>
 <overview>
   <p>Using boost::asio library but specifying a deprecated hardcoded protocol.</p>
-  <p>Using a deprecated hardcoded protocol instead of negotiting would lock your application to a protocol that has known vulnerabilities or weaknesses.</p>
+  <p>Using a deprecated hardcoded protocol instead of negotiating would lock your application to a protocol that has known vulnerabilities or weaknesses.</p>
 </overview>
 
 <references>