CPP: Tiny qldoc fixes.

cpp/ql/src/jsf/4.10 Classes/AV Rule 81.ql

@@ -51,7 +51,7 @@ class ReferenceCopyAssignmentOperator extends MemberFunction {
 
   /**
    * A call to a function called swap. Note: could be a member,
-   * std::swap or a function overloading std::swap (not in std::)
+   * `std::swap` or a function overloading `std::swap` (not in `std::`)
    * so keep it simple
    */
   FunctionCall getASwapCall() {

cpp/ql/src/jsf/4.21 Operators/AV Rule 159.ql

@@ -10,7 +10,7 @@
 
 /*
  * See More Effective C++ item 7.
- * Note: Meyers allows unary & to be overloaded but not comma
+ * Note: Meyers allows unary `&` to be overloaded but not comma.
  */
 
 import cpp

cpp/ql/src/jsf/4.28 Portable Code/AV Rule 213.ql

@@ -15,11 +15,11 @@ import cpp
 /*
  * Interpretation and deviations:
  *   - if the higher operator has precedence > arithmetic then it is fine
- *     RATIONALE: exprs like f(), *x, &x are easily understood to bind tightly
+ *     RATIONALE: exprs like `f()`, `*x`, `&x` are easily understood to bind tightly
  *   - if the higher operator is the RHS of an assign then it is fine
  *     RATIONALE: cf. MISRA, too many cases excluded otherwise
  *   - comparison operators can be mixed with arithmetic
- *     RATIONALE: x==y+z is common and unambiguous
+ *     RATIONALE: `x==y+z` is common and unambiguous
  */
 
 predicate arithmeticPrecedence(int p) { p = 12 or p = 13 }