docs(codegen): fix malformed config options block

Part of #5368.

The config options block on the code generation page does not parse as valid TypeScript. Four fields (useEnumType, enumStyle, outputRegexConstants, httpResolverOptions) sit outside any type, followed by a stray closing brace.

Introduced by two changes landing on adjacent lines: #5135 and #5304.

Fixed by #5366.