Fix typo in IOptionsMonitor section link in options.md

[FelixEckl]

A wrong anchor has been attachted to line 476: instead of linking to the section in the IOptionsMonitor it lead to the section in IOptionsSnapshot, due to the incorrect ancor.

• Changed Covered later in this article in the [Use IOptionsMonitor to read updated data](#use-ioptionssnapshot-to-read-updated-data) section. to Covered later in this article in the [Use IOptionsMonitor to read updated data](#use-ioptionsmonitor-to-read-updated-data) section.
• Fixes Configuration: Incorrect anchor linik to IOptionMonitor #36896

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aspnetcore/fundamentals/configuration/options.md	Options pattern in ASP.NET Core

[FelixEckl]

@wadepickett that should fix it. Thanks for the opportunity to contribute to this awesome piece of documentation.

[wadepickett]

Perfect! Approved.

[wadepickett]

@FelixEckl thanks for improving this doc and for your earlier help on the docs. Greatly appreciated!