KTOR-8110 Document deferred session retrieval

[vnikolova]

KTOR-8110

[coderabbitai]

Walkthrough

A new section titled "Deferred session retrieval" was added to the server sessions documentation. This section explains the default session retrieval behavior in Ktor and introduces an option to defer session loading by setting a specific system property, providing details on how to enable this optimization.

Changes

File(s)	Change Summary
topics/server-sessions.md	Added documentation about deferred session retrieval and its configuration via a system property.

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[coderabbitai]

Actionable comments posted: 0

🧹 Nitpick comments (2)

topics/server-sessions.md (2)

228-228: Add an explicit {id} anchor for consistency with the other sections

All previous top-level subsections specify an {id="…"} anchor. Adding it here keeps the documentation’s deep-link URLs predictable and avoids future broken cross-references.

-## Deferred session retrieval
+## Deferred session retrieval {id="deferred_session_retrieval"}

---

234-238: Clarify when and how to set the system property

1. Mention that the property must be set before the embeddedServer { … } block starts so that the plugin picks it up.
2. Show the more common -D JVM flag alternative, which is easier to use in production than calling System.setProperty in code.

```kotlin
-System.setProperty("io.ktor.server.sessions.deferred", "true")
+// Must be set before starting the server.  
+System.setProperty("io.ktor.server.sessions.deferred", "true")   // in code
+
+// or pass it via the JVM:
+// java -Dio.ktor.server.sessions.deferred=true -jar myapp.jar

This small addition saves readers a round-trip to other docs and prevents subtle “property set too late” issues.

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<details>
<summary>📜 Review details</summary>

**Configuration used: CodeRabbit UI**
**Review profile: CHILL**
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<summary>📥 Commits</summary>

Reviewing files that changed from the base of the PR and between 262e4edaaaf432c592ae47f35dff17d34da468ca and e8d478b42aa1f9cac1083d1f841861bd39601539.

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<summary>📒 Files selected for processing (1)</summary>

* `topics/server-sessions.md` (1 hunks)

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