Update the message

Author: zhengbli

src/compiler/diagnosticMessages.json

@@ -3247,7 +3247,7 @@
         "category": "Message",
         "code": 90003
     },
-    "Remove the unused identifier: {0}": {
+    "Remove declaration for: {0}": {
         "category": "Message",
         "code": 90004
     },

src/services/codefixes/unusedIdentifierFixes.ts

@@ -146,7 +146,7 @@ namespace ts.codefix {
 
             function createCodeFix(newText: string, start: number, length: number): CodeAction[] {
                 return [{
-                    description: formatStringFromArgs(getLocaleSpecificMessage(Diagnostics.Remove_the_unused_identifier_Colon_0), { 0: token.getText() }),
+                    description: formatStringFromArgs(getLocaleSpecificMessage(Diagnostics.Remove_declaration_for_Colon_0), { 0: token.getText() }),
                     changes: [{
                         fileName: sourceFile.fileName,
                         textChanges: [{ newText, span: { start, length } }]