Fix documentation search

[aledbf]

Error introduced in https://travis-ci.org/kubernetes/ingress-nginx/jobs/421862731#L585

[antoineco]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aledbf, antoineco

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[aledbf]

Merging to fix docs

[codecov-io]

Codecov Report

Merging #3021 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3021   +/-   ##
=======================================
  Coverage   47.48%   47.48%           
=======================================
  Files          77       77           
  Lines        5644     5644           
=======================================
  Hits         2680     2680           
  Misses       2611     2611           
  Partials      353      353

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