docs: "Runtime Context" -> Execution Context (#1313)

Fix wording: "Runtime Context" should be "Execution Context"

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## Summary by CodeRabbit

## Release Notes

* **Documentation**
* Updated Server Actions documentation terminology to provide clearer
guidance on execution contexts, improving clarity for developers working
with Server Actions.

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Author: johnpyp

apps/content/docs/server-action.md

@@ -32,7 +32,7 @@ export const ping = os
 ```
 
 :::tip
-We recommend using [Runtime Context](/docs/context#execution-context) instead of [Initial Context](/docs/context#initial-context) when working with Server Actions.
+We recommend using [Execution Context](/docs/context#execution-context) instead of [Initial Context](/docs/context#initial-context) when working with Server Actions.
 :::
 
 :::warning