Increase severity of UseConstrainedLanguageMode to Warning for optional rule

Author: joshcorr

Rules/UseConstrainedLanguageMode.cs

@@ -973,15 +973,15 @@ public override string GetName()
         /// </summary>
         public override RuleSeverity GetSeverity()
         {
-            return RuleSeverity.Information;
+            return RuleSeverity.Warning;
         }
 
         /// <summary>
         /// Gets the severity of the returned diagnostic record: error, warning, or information.
         /// </summary>
         public DiagnosticSeverity GetDiagnosticSeverity()
         {
-            return DiagnosticSeverity.Information;
+            return DiagnosticSeverity.Warning;
         }
 
         /// <summary>

docs/Rules/UseConstrainedLanguageMode.md

@@ -6,7 +6,7 @@ title: UseConstrainedLanguageMode
 ---
 # UseConstrainedLanguageMode
 
-**Severity Level: Information**
+**Severity Level: Warning**
 
 ## Description