Fix incorrect path of edgecore configuration

[uonxhou]

• Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

Which issue(s) this PR fixes:

Fixes #

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
  docs update

• What is the current behavior? (You can also link to an open issue here)
  The configuration path of edgecore is wrong in Advanced Configuration:
  

• What is the new behavior (if this is a feature change)?

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)

• Other information:

[kubeedge-bot]

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[kubeedge-bot]

Welcome @uonxhou! It looks like this is your first PR to kubeedge/website 🎉

[Shelley-BaoYue]

@uonxhou Thanks for your contributions! Please according https://kubeedge.io/docs/developer/Supplemental_developer_guide#dco to fix DCO