Fix unused var

Author: theletterf

package.json

@@ -2,7 +2,7 @@
   "name": "elastic-docs-v3-utilities",
   "displayName": "Elastic Docs Utilities",
   "description": "Utilities for Elastic Docs authoring",
-  "version": "0.12.6",
+  "version": "0.12.7",
   "publisher": "Elastic",
   "repository": {
     "type": "git",

src/directiveDiagnosticProvider.ts

@@ -258,7 +258,6 @@ export class DirectiveDiagnosticProvider {
                 // Create a range covering all content lines
                 const firstContentLine = block.contentLines[0];
                 const lastContentLine = block.contentLines[block.contentLines.length - 1];
-                const firstLine = document.lineAt(firstContentLine);
                 const lastLine = document.lineAt(lastContentLine);
                 const contentRange = new vscode.Range(
                     new vscode.Position(firstContentLine, 0),