feat: add optional chaining to prevent types errors and add an example of helper lines (#1904)
* docs: code errors in "Updating Node Data" (#1900)
fix(docs): Example of fixing code errors in "Updating Node Data"
* fix: add optional chaining to prevent errors in link filtering
* feat: add an example of helper lines
* refactor: In the HelperLines example, replace the observer with dimensions
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Co-authored-by: Charles Lee <114982593+rookie-orange@users.noreply.github.com>
Co-authored-by: J <gongjie0422@163.com>
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