Update exposing-tcp-udp-services.md

[mustafaakin]

What this PR does / why we need it:

Minor tick missing for syntax highlighting which makes it look ugly on https://kubernetes.github.io/ingress-nginx/user-guide/exposing-tcp-udp-services/

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[mustafaakin]

hi

[codecov-io]

Codecov Report

Merging #2436 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2436      +/-   ##
==========================================
- Coverage   41.37%   41.35%   -0.02%     
==========================================
  Files          74       74              
  Lines        5262     5262              
==========================================
- Hits         2177     2176       -1     
- Misses       2789     2791       +2     
+ Partials      296      295       -1

Impacted Files	Coverage Δ
internal/watch/file_watcher.go	80.76% <0%> (-3.85%)	⬇️

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[aledbf]

/lgtm

[aledbf]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[aledbf]

@mustafaakin thanks!