Spelling mistake on webpage

[dik23]

https://docs.crowdsec.net/docs/bouncers/aws_waf

"Optionnaly, the bouncer can also be configured using only environment variables."

[mmetc]

fixed in https://github.com/crowdsecurity/crowdsec-docs/commit/c8d474267c9fbfff6acce7ec1b33305e4148d247