Serialiser_Engine: serialisation of methods with out collection parameters yields suspicious results

#### Description:

I have just noticed that serialisation of methods with `out` parameters of collection type results in slightly different format where:
- `out` param of collection type comes out as `System.Collections.Generic.List`1[[System.Double]]&` or similar
- non-out param of collection type comes out as `System.Collections.Generic.List`1` with `GenericArguments` field

Not a critical bug because both strings deserialise, but worth aligning.

#### Test file:
On [SharePoint](https://burohappold.sharepoint.com/sites/BHoM/02_Current/Forms/AllItems.aspx?FolderCTID=0x0120008122C8891F89054B8ACED0196C70DFC4&id=%2Fsites%2FBHoM%2F02%5FCurrent%2F12%5FScripts%2F01%5FIssue%2FBHoM%2FBHoM%5FEngine%2FVersioning%5FEngine%2F%233384%2DVersioningKeyBug)