Update description of xssFilter for helmet in best-practice-security.md #1248
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The helmet package disables the XSS filter built into web browsers by setting the
X-XSS-Protectionheader's value to0.https://github.com/helmetjs/helmet#reference
The filter has been retired in Chrome & Edge, and Firefox has refused to implement it due to known issues:
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-XSS-Protection
The recommended practice is to disable the built-in filter and use alternate methods for protecting against XSS attacks like using a CSP header, sanitize inputs, etc.