.Net: Fix typo (#9824)

### Motivation and Context

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A typo is causing the spell check in our pipeline to fail, thus block
PRs.

### Description
Fix the typo.

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### Contribution Checklist

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- [ ] The code builds clean without any errors or warnings
- [ ] The PR follows the [SK Contribution
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raises no violations
- [ ] All unit tests pass, and I have added new tests where possible
- [ ] I didn't break anyone 😄

dotnet/src/Connectors/Connectors.Memory.Kusto/KustoMemoryStore.cs

@@ -374,7 +374,7 @@ private static string GetCollectionName(string tableName)
     /// Returns base Kusto query.
     /// </summary>
     /// <remarks>
-    /// Kusto is an append-only store. Although deletions are possible, they are highly discourged,
+    /// Kusto is an append-only store. Although deletions are possible, they are highly discouraged,
     /// and should only be used in rare cases (see: https://learn.microsoft.com/en-us/azure/data-explorer/kusto/concepts/data-soft-delete#use-cases).
     /// As such, the recommended approach for dealing with row updates is versioning.
     /// An easy way to achieve this is by using the ingestion time of the record (insertion time).