Update descriptions to better reflect rationale

Author: jeongsoolee09

cpp/misra/src/rules/RULE-21-6-2/DynamicMemoryManagedManually.ql

@@ -1,7 +1,8 @@
 /**
  * @id cpp/misra/dynamic-memory-managed-manually
  * @name RULE-21-6-2: Dynamic memory shall be managed automatically
- * @description Dynamically allocated memory must not be managed manually.
+ * @description Manually allocating and deallocating is error prone and may cause memory safety bugs
+ *              such as memory leaks, use-after-frees, or double frees.
  * @kind problem
  * @precision very-high
  * @problem.severity error

cpp/misra/src/rules/RULE-21-6-3/AdvancedMemoryManagementUsed.ql

@@ -1,9 +1,8 @@
 /**
  * @id cpp/misra/advanced-memory-management-used
  * @name RULE-21-6-3: Advanced memory management shall not be used
- * @description Using advanced memory management that either alters allocation and deallocation or
- *              constructs object construction on uninitalized memory may result in undefined
- *              behavior.
+ * @description Advanced memory management may introduce subtle bugs related to lifetime and
+ *              alignment, which may cause undefined behavior.
  * @kind problem
  * @precision very-high
  * @problem.severity error

rule_packages/cpp/Memory5.json

@@ -7,7 +7,7 @@
       },
       "queries": [
         {
-          "description": "Dynamically allocated memory must not be managed manually.",
+          "description": "Manually allocating and deallocating is error prone and may cause memory safety bugs such as memory leaks, use-after-frees, or double frees.",
           "kind": "problem",
           "name": "Dynamic memory shall be managed automatically",
           "precision": "very-high",

rule_packages/cpp/Memory6.json

@@ -7,7 +7,7 @@
       },
       "queries": [
         {
-          "description": "Using advanced memory management that either alters allocation and deallocation or constructs object construction on uninitalized memory may result in undefined behavior.",
+          "description": "Advanced memory management may introduce subtle bugs related to lifetime and alignment, which may cause undefined behavior.",
           "kind": "problem",
           "name": "Advanced memory management shall not be used",
           "precision": "very-high",
@@ -18,7 +18,7 @@
           ]
         }
       ],
-      "title": "Using advanced memory management that either alters allocation and deallocation or constructs object construction on uninitalized memory may result in undefined behavior."
+      "title": "Advanced memory management may introduce subtle bugs related to lifetime and alignment, which may cause undefined behavior."
     }
   }
 }