Use language neutral links to MDN

[tobiaswiese]

What this PR does / why we need it: The documentation used links to the Spanish version of some MDN sites. This changes it, to use links that automatically redirect to the language the users browser sends.

[tobiaswiese]

/assign @nicksardo

[aledbf]

@Info-Screen please don't assign PRs manually

[aledbf]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aledbf, Info-Screen

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[aledbf]

@Info-Screen thanks!

[codecov-io]

Codecov Report

Merging #2764 into master will increase coverage by 0.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2764      +/-   ##
==========================================
+ Coverage   40.92%   41.06%   +0.13%     
==========================================
  Files          73       73              
  Lines        5102     5102              
==========================================
+ Hits         2088     2095       +7     
+ Misses       2725     2719       -6     
+ Partials      289      288       -1

Impacted Files	Coverage Δ
cmd/nginx/main.go	27.73% <0%> (+5.1%)	⬆️

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