Update HttpBasics_plan.adoc - https://www.zaproxy.org/ by boly38 · Pull Request #1803 · WebGoat/WebGoat
docs: minor: fix broken link OWASP ZAP - use official website link https://www.zaproxy.org/ (src)
It seems that ZAP is not directly published under OWASP website now but has it's own domain.
broken link: https://www.owasp.org/index.php/OWASP_Zed_Attack_Proxy_Project
(sorry for the branch name I initiate this PR with github UI. I'll do better branch name next time).