Examples can only be used with Scenario Outlines. Scenario Outlines are ways to run a scenario with different data sets.
If you change Scenario
to Scenario Outline
your example will work:
Feature: Homepage
As a webiste user
I want to see a pretty homepage
Scenario Outline: Homepage Display
Given I am on an ecommerce <website>
When I look at the content
Then I should see a swiper
Examples:
| Description | website |
| Local | localhost:9000 |
| Development | dev.mysite.com |
The GitHub Cucumber page has a good explanation of Scenario Outlines:
https://github.com/cucumber/cucumber/wiki/Scenario-outlines