[🚀 Feature]: mention the usage of By.xpath in findElement chain

[benyue1978]

Feature and motivation

Took me quite some time to figure out that I need to use relative path in the xpath expression to chain a By.xpath in the locator.
xpathExpression = ".//b" // this one works
xpathExpression = "//b" // it will find all elements from the root of DOM

It may worth mentioning in the doc
https://www.selenium.dev/documentation/webdriver/elements/finders/#evaluating-a-subset-of-the-dom
or
https://www.selenium.dev/documentation/webdriver/elements/finders/#find-elements-from-element

[github-actions]

@benyue1978, thank you for creating this issue. We will troubleshoot it as soon as we can.

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Thank you!

[diemol]

Would you like to send a PR to improve that section of the documentation?