Update @problem.severity metadata

Author: jeongsoolee09

cpp/misra/src/rules/RULE-10-2-2/UnscopedEnumerationsShouldNotBeDeclared.ql

@@ -6,7 +6,7 @@
  *              types.
  * @kind problem
  * @precision very-high
- * @problem.severity error
+ * @problem.severity warning
  * @tags external/misra/id/rule-10-2-2
  *       scope/single-translation-unit
  *       correctness

cpp/misra/src/rules/RULE-10-3-1/UnnamedNamespacesInHeaderFiles.ql

@@ -5,7 +5,7 @@
  *              unit, which may not be consistent with developer expectations.
  * @kind problem
  * @precision very-high
- * @problem.severity error
+ * @problem.severity warning
  * @tags external/misra/id/rule-10-3-1
  *       scope/single-translation-unit
  *       correctness

rule_packages/cpp/Banned2.json

@@ -11,7 +11,7 @@
           "kind": "problem",
           "name": "Unscoped enumerations should not be declared",
           "precision": "very-high",
-          "severity": "error",
+          "severity": "warning",
           "short_name": "UnscopedEnumerationsShouldNotBeDeclared",
           "tags": [
             "scope/single-translation-unit",

rule_packages/cpp/Banned4.json

@@ -11,7 +11,7 @@
           "kind": "problem",
           "name": "There should be no unnamed namespaces in header files",
           "precision": "very-high",
-          "severity": "error",
+          "severity": "warning",
           "short_name": "UnnamedNamespacesInHeaderFiles",
           "tags": [
             "scope/single-translation-unit",