Fix OpenAPI version in NAP WAF docs

[lucacome]

The version of OpenAPI is not related to the Ingress Controller. Reverting this to the original value.

[codecov]

Codecov Report

Merging #3697 (da2ccde) into release-3.1 (ae86733) will increase coverage by 0.02%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           release-3.1    #3697      +/-   ##
===============================================
+ Coverage        52.33%   52.35%   +0.02%     
===============================================
  Files               59       59              
  Lines            16880    16880              
===============================================
+ Hits              8834     8838       +4     
+ Misses            7749     7747       -2     
+ Partials           297      295       -2     

see 1 file with indirect coverage changes

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