Update EditableMesh.yaml and AssetService.yaml

[sammygrey]

Changes

Changed one reference of "content" in EditableMesh.yaml to link to the Content datatype. Also added summaries for content parameters in AssetService.yaml to better explain what they are.

Credit to @MrChickenRocket for making the bug report here asking for clarification on Content.

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[sammygrey]

There also needs to be edits made to the Code Sample for EditableMesh:RaycastLocal()to not use editableMesh:CreateMeshPartAsync() which is deprecated.

I'm working on a fix for this, but the recent changes to the EditableMesh datatype are making this a pain to debug.

Looks like theres an issue with the return type for AssetService:CreateEditableMeshAsync(), so I'll wait till my bug report is addressed for providing an example fix for this.

[ConorGriffin37]

Thanks for the PR.

For the RaycastLocal code sample, we should just be able to change it to use AssetService:CreateMeshPartAsync(Content.fromObject(editableMesh))

I will follow up on the above bug report because I'm not sure if there is an issue there.

[IgnisRBX]

FYI @sammygrey , I just processed a separate update for the code sample you speak of to fix the issue. That should be synched live soon, so we can close the loop on this. :)