docs: mention Terser instead of UglifyJS

[cexbrayat]

Now that #11996 landed, the CLI uses Terser instead of UglifyJS.

[alan-agius4]

Thanks for the PR. However, the documentation here is correct as this is strictly for version 6. Version 7 documentation has been moved to https://angular.io/guide/build

There is currently an open PR to improve the overall descriptions #12741

[cexbrayat]

@alan-agius4 Ha right, sorry.

Maybe this is still interesting for the README of build-optimizer which still mention UglifyJS though?

[alan-agius4]

If you want to go ahead a remove it that it’s fine by me. Though I suggest not to mention the brand or tool that can be used as strictly speaking it can work with any js optimization tool.

For instance instead of UglifyJS you can use JS optimization tools

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