docs: fix KongProtocol doc

[pmalek]

What this PR does / why we need it:

This PR fixes KongProtocol doc by adding a missing dot at the end.

[codecov]

Codecov Report

Base: 74.1% // Head: 74.1% // Increases project coverage by +0.0% 🎉

Coverage data is based on head (842cee2) compared to base (d662b6e).
Patch coverage: 100.0% of modified lines in pull request are covered.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #3371   +/-   ##
=====================================
  Coverage   74.1%   74.1%           
=====================================
  Files        110     110           
  Lines      13238   13227   -11     
=====================================
- Hits        9820    9812    -8     
+ Misses      2794    2791    -3     
  Partials     624     624           

Impacted Files	Coverage Δ
internal/dataplane/parser/translators/ingress.go	91.7% <100.0%> (-0.6%)	⬇️
...nternal/controllers/gateway/udproute_controller.go	73.6% <0.0%> (-2.8%)	⬇️
internal/dataplane/parser/parser.go	89.7% <0.0%> (-0.9%)	⬇️
...nternal/controllers/gateway/tlsroute_controller.go	75.8% <0.0%> (+2.6%)	⬆️
...nternal/controllers/gateway/tcproute_controller.go	75.6% <0.0%> (+2.6%)	⬆️

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