Document throw-on-not-implemented-tls-options compat flag (#31235)

Author: dom96

src/content/compatibility-flags/throw-on-not-implemented-tls-options.md

@@ -0,0 +1,14 @@
+---
+_build:
+  publishResources: false
+  render: never
+  list: never
+
+name: "Throw On Not Implements TLS Options"
+sort_date: "2026-06-16"
+enable_date: "2026-06-16"
+enable_flag: "throw_on_not_implemented_tls_options"
+disable_flag: "no_throw_on_not_implemented_tls_options"
+---
+
+When enabled, passing unsupported TLS options (e.g. `checkServerIdentity`) to `tls.connect()` or `new TLSSocket()` throws `ERR_OPTION_NOT_IMPLEMENTED` instead of silently ignoring them