NIT: Correct comment re default of server-tokens=false
NIT: Correct comment re default of server-tokens=false

The default value of ShowServerTokens aka server-tokens in the
global configmap was changed in commit
87aa96b4680ecc9c3b3c89c647791271184929d9 in 2020-09-17 (release v0.40.0)
but one reference was overlooked in this comment.

Other documentation, implementation and testcases are all in agreement.
Correct the comment to align with others: server-tokens=false.

canhnt/ingress,canhnt/ingress,kubernetes/ingress-nginx,kubernetes/ingress-nginx,kubernetes/ingress-nginx,kubernetes/ingress-nginx,canhnt/ingress,kubernetes/ingress-nginx,canhnt/ingress