Doc error

[lienonegithub]

Version

5.0.2

Reproduction link

https://echarts.apache.org/zh/option.html#series-lines.markPoint

Steps to reproduce

quote: 'For example, [0, '50%'] means to move upside side position of symbol height. It can be used to make the arrow in the bottom to be at data position when symbol is pin.'

What is expected?

it should be [0, '-50%']

What is actually happening?

It can be used to make the arrow in the bottom to be at data position when symbol is pin.

[echarts-bot]

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[susiwen8]

PR is welcome

[lienonegithub]

#170