Improve documentation for CreateAssetAsync (#1049)

## Changes

The asset creation methods is currently only usable by plugins loaded in
the LocalPlugin folder, this change marks that in the two relevant
methods.

## Checks

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- [x] This contribution was created in whole or in part by me, and I
have the right to submit it under the terms of this repository's open
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- [x] I understand and agree that this contribution and a record of it
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- [x] To the best of my knowledge, all proposed changes are accurate.

---------

Co-authored-by: IgnisRBX <[email protected]>
Co-authored-by: Francis O'Brien <[email protected]>

Author: 3 people

content/en-us/reference/engine/classes/AssetService.yaml

@@ -94,10 +94,12 @@ methods:
     writeCapabilities: []
   - name: AssetService:CreateAssetAsync
     summary: |
-      Creates a new asset from the given object.
+      Uploads a new asset to Roblox from the given object.
     description: |
-      Creates a new asset from the given object in Plugin or Open Cloud Luau
-      Execution context.
+      Uploads a new asset to Roblox from the given object.
+
+      Currently, this method can only be used in locally loaded plugins and uploads
+      assets without prompting first.
     code_samples:
       - AssetService-CreateAssetAsync
     parameters:
@@ -150,10 +152,12 @@ methods:
     writeCapabilities: []
   - name: AssetService:CreateAssetVersionAsync
     summary: |
-      Creates a new version for an existing asset from the given object.
+      Uploads a new version for an existing asset from the given object.
     description: |
-      Creates a new version for an existing asset from the given object in
-      Plugin or Open Cloud Luau Execution context.
+      Uploads a new version for an existing asset from the given object.
+
+      Currently, this method can only be used in locally loaded plugins and uploads
+      assets without prompting first.
     code_samples:
       - AssetService-CreateAssetVersionAsync
     parameters: