fix(examples/sites/demos/apis/chart-line):[alert]fix document problem bug #2650
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PR
PR Checklist
Please check if your PR fulfills the following requirements:
PR Type
What kind of change does this PR introduce?
What is the current behavior?
Issue Number: 2634
What is the new behavior?
在文档中已经显示了area的参数
Does this PR introduce a breaking change?
Other information
Summary by CodeRabbit
area
option for thechart-line
component, allowing users to display the line chart as an area chart.