add xLexih as a contributor for doc

[allcontributors]

Adds @xLexih as a contributor for doc.

This was requested by pixiake in this comment

[skip ci]

[kubesphere-prow]

This PR has multiple commits, and the default merge method is: squash.
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[kubesphere-prow]

Adding the "do-not-merge/release-note-label-needed" label because no release-note block was detected, please follow our release note process to remove it.

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[kubesphere-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud