doc: http2.createServer options as optional

The method might be designed to explicitly take `options`. However,
the implementation and many examples already allow the first parameter
of a function type.

PR-URL: #42832
Reviewed-By: Matteo Collina <[email protected]>
Reviewed-By: Robert Nagy <[email protected]>
Reviewed-By: Paolo Insogna <[email protected]>
Reviewed-By: Mestery <[email protected]>
Reviewed-By: Rafael Gonzaga <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Darshan Sen <[email protected]>

doc/api/http2.md

@@ -2343,7 +2343,7 @@ Throws `ERR_HTTP2_INVALID_SETTING_VALUE` for invalid `settings` values.
 
 Throws `ERR_INVALID_ARG_TYPE` for invalid `settings` argument.
 
-### `http2.createServer(options[, onRequestHandler])`
+### `http2.createServer([options][, onRequestHandler])`
 
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