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Update solution_architecture.md 

Linking to master instead of specific file version.

Co-authored-by: Michael Frey <michael.frey@gmx.ch>
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@ -219,7 +219,7 @@ According to the [documentation of the framework](https://developer.apple.com/do
Their sum and a default bucket offset (called *weight_4* in *Figure 13*) forms the *Exposure Score*.
Finally, the maximum of the *total risk score* over all the considered events, i.e. the largest risk score, is normalized and then multiplied with the above exposure score. The resulting product of the *exposure score* and the *normalized maximum total risk score* then forms the so called **combined risk score**.
The combined risk score is used to determine which defined risk level should be displayed to the user, e.g. “low risk” or “high risk”. For this decision, [app-defined thresholds](https://github.com/corona-warn-app/cwa-server/blob/eb8be6c3e9c723c62c619784e41889d10054cc93/services/distribution/src/main/resources/master-config/risk-score-classification.yaml) for the individual risk levels apply.
The combined risk score is used to determine which defined risk level should be displayed to the user, e.g. “low risk” or “high risk”. For this decision, [app-defined thresholds](https://github.com/corona-warn-app/cwa-server/blob/master/services/distribution/src/main/resources/master-config/risk-score-classification.yaml) for the individual risk levels apply.
As the values above are multiplied with each other, a single category with a risk score of 0 means that the overall risk score is also 0.
Additionally, a central threshold for the combined risk score specifies whether an exposure event should be considered or not.
Furthermore the Google/Apple framework allows to set a [```minimalRiskScore```](https://developer.apple.com/documentation/exposurenotification/enexposureconfiguration/3583692-minimumriskscore) to exclude exposure incidents with scores lower than the value of this property.