tools: fix typo in .eslintrc.js

Refs: nodejs#18566

PR-URL: nodejs#21449
Reviewed-By: Richard Lau <[email protected]>
Reviewed-By: Vse Mozhet Byt <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Tobias Nießen <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>

Author: boneskull

.eslintrc.js

@@ -131,7 +131,7 @@ module.exports = {
       {
         object: 'assert',
         property: 'equal',
-        message: 'Use assert.astrictEqual() rather than assert.equal().',
+        message: 'Use assert.strictEqual() rather than assert.equal().',
       },
       {
         object: 'assert',