Add description and new code example

[MongoCaleb]

Pull Request Info - SDK Docs Consolidation

Jira ticket: DOCSP-34405

Staging Links

sdk/dotnet/react-to-changes

Release Notes

• .NET SDK
  • Add KeyPathsCollection information & code snippet.

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[github-actions]

Readability for Commit Hash: 4723800

You can see any previous Readability scores (if they exist) by looking
at the comment's history.

Readability scores for changed documents:

• source/sdk/dotnet/react-to-changes: Grade Level: 10.8, Reading Ease: 41.16

For Grade Level, aim for 8 or below.

For Reading Ease scores, aim for 60 or above:

Score	Difficulty
90-100	Very Easy
80-89	Easy
70-79	Fairly Easy
60-69	Medium
50-59	Fairly Hard
30-49	Hard
0-29	Very Hard

For help improving readability, try Hemingway App.

[dacharyc]

LGTM!