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Remove double word from solution architecture 

This commit removes one "minutes" too much from the solution architecture document.
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@ -343,7 +343,7 @@ In order for the EFGS to function correctly, all users must specify their visite
## LIMITATIONS
Even though the system can support individuals in finding out whether they have been in proximity with a person that has been tested positive later on, the system also has limits (shown in *Figure 19*) that need to be considered. One of those limitations is that while the device constantly broadcasts its own Rolling Proximity Identifiers, it only listens for others in defined time slots. Those listening windows are three minutes minutes apart and are defined as being only very short. In our considerations we expect the windows to have a length of four seconds. A lower attenuation means that the other device is closer, while a higher attenuation might either mean that the other device is farther away (e.g. a distance of more than two meters) or that there is something between the devices blocking the signal. This could be objects such as a wall, but also humans or animals.
Even though the system can support individuals in finding out whether they have been in proximity with a person that has been tested positive later on, the system also has limits (shown in *Figure 19*) that need to be considered. One of those limitations is that while the device constantly broadcasts its own Rolling Proximity Identifiers, it only listens for others in defined time slots. Those listening windows are three minutes apart and are defined as being only very short. In our considerations we expect the windows to have a length of four seconds. A lower attenuation means that the other device is closer, while a higher attenuation might either mean that the other device is farther away (e.g. a distance of more than two meters) or that there is something between the devices blocking the signal. This could be objects such as a wall, but also humans or animals.
| ![Figure 19: Limitations of the Bluetooth Low Energy approach](images/solution_architecture/limitations.svg "Figure 19: Limitations of the Bluetooth Low Energy approach") |
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