C++: Update some tags following feedback.

Author: geoffw0

cpp/ql/src/Best Practices/RuleOfTwo.ql

@@ -9,7 +9,7 @@
  * @id cpp/rule-of-two
  * @tags quality
  *       reliability
- *       readability
+ *       correctness
  *       language-features
  */
 

cpp/ql/src/Likely Bugs/Likely Typos/DubiousNullCheck.ql

@@ -8,7 +8,7 @@
  * @id cpp/dubious-null-check
  * @tags quality
  *       reliability
- *       readability
+ *       correctness
  */
 
 import cpp

cpp/ql/src/Likely Bugs/Likely Typos/FutileConditional.ql

@@ -7,8 +7,8 @@
  * @precision high
  * @id cpp/empty-if
  * @tags quality
- *       reliability
- *       readability
+ *       maintainability
+ *       useless-code
  */
 
 import cpp

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

@@ -8,8 +8,8 @@
  * @precision high
  * @id cpp/implicit-function-declaration
  * @tags quality
+ *       reliability
  *       correctness
- *       maintainability
  */
 
 import cpp

cpp/ql/src/Likely Bugs/Underspecified Functions/TooManyArguments.ql

@@ -8,8 +8,8 @@
  * @precision very-high
  * @id cpp/futile-params
  * @tags quality
+ *       reliability
  *       correctness
- *       maintainability
  */
 
 import cpp

cpp/ql/src/jsf/4.10 Classes/AV Rule 79.ql

@@ -7,8 +7,8 @@
  * @id cpp/resource-not-released-in-destructor
  * @tags quality
  *       reliability
+ *       correctness
  *       efficiency
- *       readability
  *       external/cwe/cwe-404
  *       external/jsf
  */