Update cpp/ql/src/Critical/DoubleFree.qhelp

Co-authored-by: Ben Ahmady <32935794+subatoi@users.noreply.github.com>

Author: geoffw0

cpp/ql/src/Critical/DoubleFree.qhelp

@@ -26,9 +26,8 @@ In the following example, <code>buff</code> is allocated and then freed twice:
 </p>
 <sample src="DoubleFreeBad.cpp" />
 <p>
-Reviewing the code above, the issue can be fixed by simply deleting the additonal call to
-<code>free(buff)</code>. Another buffer <code>new_buffer</code> is allocated, but we can see the intent was
-not to free <code>new_buffer</code> as this pointer is returned by the function.
+Reviewing the code above, the issue can be fixed by simply deleting the additional call to
+<code>free(buff)</code>.
 </p>
 <sample src="DoubleFreeGood.cpp" />
 <p>