Docsp-35796: Add info about new Sync Schema Migrations to SDK pages

[MongoCaleb]

Pull Request Info

Jira ticket: https://jira.mongodb.org/browse/DOCSP-35796

• Fluttter
• Java
• Kotlin
• .NET
• NodeJS
• React Native
• Swift

Release Notes

[github-actions]

Readability for Commit Hash: 69d75c2

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

Readability scores for changed documents:

• source/sdk/kotlin/realm-database/schemas/change-an-object-model: Grade Level: 8.6, Reading Ease: 57.67
• source/sdk/dotnet/model-data/change-an-object-model: Grade Level: 10.3, Reading Ease: 58.72
• source/sdk/node/model-data/modify-an-object-schema: Grade Level: 8.3, Reading Ease: 63.8
• source/sdk/java/model-data/modify-an-object-schema: Grade Level: 9.3, Reading Ease: 55.74
• source/sdk/flutter/realm-database/model-data/update-realm-object-schema: Grade Level: 8.6, Reading Ease: 57.77
• source/sdk/react-native/model-data/change-an-object-model: Grade Level: 8.9, Reading Ease: 56.96
• source/sdk/swift/model-data/change-an-object-model: Grade Level: 8.8, Reading Ease: 57.16

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.

[cbullinger]

lgtm! Thanks so much for your help on this! The only other suggestion would be to increase the On this page depth by one, so the updated subheadings are included in the toc, but that's not blocking at all

[cbullinger]

Suggest we bump this one sentence to go before the "Synced realms:" list

[dacharyc]

This has become a "won't do" so closing this PR.