Update typescript.md

[saeid-elio]

Without <{}> TypeScript compiler shows this error: Generic type 'NavigationContainerRef' requires 1 type argument(s).ts(2314)

READ ME PLEASE

TL;DR: Make sure to add your changes to versioned docs

Thanks for opening a PR!

The docs cover several versions of react-navigation, and in some cases there are several files (for version 1, version 2 and etc.) that all describe a single page of the docs (eg. "Getting Started").

Please make sure that the edit you're making in docs/file-you-edited.md is also included in the file for the correct version, eg. /versioned_docs/version-3.x/file-you-edited.md for version 3. If such file doesn't exist, please create it. :+1:

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[satya164]

Thanks for the PR. This page is for 5.x where NavigationContainerRef didn't accept any parameter, so this is not correct. The documentation for 6.x and onwards already includes the parameter.