cpp: address review nits on qhelp references and test header

Author: Tito0015

cpp/ql/src/experimental/Security/CWE/CWE-120/MmioUnsanitizedMemcpy.qhelp

@@ -24,11 +24,5 @@ and reject or clamp out-of-range values before copying.
 <sample src="MmioUnsanitizedMemcpyGood.c" />
 </example>
 <references>
-<li>
-CWE-120: Buffer Copy without Checking Size of Input
-</li>
-<li>
-CWE-787: Out-of-bounds Write
-</li>
 </references>
 </qhelp>

cpp/ql/test/experimental/query-tests/Security/CWE/CWE-120/MmioUnsanitizedMemcpy/test.c

@@ -1,4 +1,4 @@
-/* Semmle test case for MmioUnsanitizedMemcpy.ql
+/* Test case for MmioUnsanitizedMemcpy.ql
  * Allowlisted MMIO/DMA register macros flowing into memcpy/memmove/strncpy size parameters.
  */