doc: fix example in assert.md

PR-URL: nodejs#42786
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Beth Griggs <bgriggs@redhat.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Mohammed Keyvanzadeh <mohammadkeyvanzade94@gmail.com>
Reviewed-By: Akhil Marsonya <akhil.marsonya27@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Mestery <mestery@protonmail.com>
Reviewed-By: Harshitha K P <harshitha014@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

doc/api/assert.md

@@ -2155,7 +2155,7 @@ assert.throws(
 );
 
 // Using regular expressions to validate error properties:
-throws(
+assert.throws(
   () => {
     throw err;
   },
@@ -2179,7 +2179,7 @@ throws(
 );
 
 // Fails due to the different `message` and `name` properties:
-throws(
+assert.throws(
   () => {
     const otherErr = new Error('Not found');
     // Copy all enumerable properties from `err` to `otherErr`.
@@ -2224,7 +2224,7 @@ assert.throws(
 );
 
 // Using regular expressions to validate error properties:
-throws(
+assert.throws(
   () => {
     throw err;
   },
@@ -2248,7 +2248,7 @@ throws(
 );
 
 // Fails due to the different `message` and `name` properties:
-throws(
+assert.throws(
   () => {
     const otherErr = new Error('Not found');
     // Copy all enumerable properties from `err` to `otherErr`.