Add section for RegexOptions.NonBacktracking

I added the option to the table, but we should add a dedicated section with example.

_Originally posted by @stephentoub in https://github.com/dotnet/docs/pull/29708#discussion_r889007159_

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#### Document Details

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* ID: bf9b6611-d08f-2fe9-216b-e0658d7f1553
* Version Independent ID: 3d3be892-b9b5-ca0b-1193-9fa49716decb
* Content: [Options for regular expression](https://docs.microsoft.com/en-us/dotnet/standard/base-types/regular-expression-options)
* Content Source: [docs/standard/base-types/regular-expression-options.md](https://github.com/dotnet/docs/blob/main/docs/standard/base-types/regular-expression-options.md)
* Product: **dotnet-fundamentals**
* GitHub Login: @adegeo
* Microsoft Alias: **adegeo**