[Docs] Update mermai graph in design principles

[Freymaurer]

Just updated some wording for mermaid graph:

sequenceDiagram

participant Filesystem
participant Client
participant ARCtrl

Note over Client,ARCtrl: ARC.fromFilePaths
Client->>ARCtrl: filepaths
ARCtrl->>Client: ARC

Note over Client,ARCtrl: ARC.GetReadContracts
ARCtrl->>Client: contracts

Note over Client,Filesystem: File.read
Client->>Filesystem: filepath
Filesystem->>Client: DTO

Note over Client,ARCtrl: ARC.SetISAFromContracts
Client->>ARCtrl: fullfilled Contracts
ARCtrl->>Client: ARC datamodel

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[Freymaurer]

resolved in e9c0a2e