Update cpp/ql/src/Likely Bugs/Underspecified Functions/ImplicitFunctionDeclaration.qhelp

Author: geoffw0

cpp/ql/src/Likely Bugs/Underspecified Functions/ImplicitFunctionDeclaration.qhelp

@@ -14,7 +14,7 @@ function may behave unpredictably.</p>
 <p>This may indicate a misspelled function name, or that the required header containing
 the function declaration has not been included.</p>
 
-<p>Note: This query is not compatible with build mode: none databases, and produces
+<p>Note: This query is not compatible with <code>build mode: none</code> databases, and produces
 no results on those databases.</p>
 
 </overview>