Missing full stop in user guide and developer guide

There is a missing full stop under the "Deleting a group" and "Searching persons by field" section of the user guide. Also, in the "Non-Functional Requirements" of the developer guide.

**User Guide**
![image.png](https://raw.githubusercontent.com/Runus01/ped/main/files/63d03976-eea4-4885-87b0-8f6312a4e512.png)


![image.png](https://raw.githubusercontent.com/Runus01/ped/main/files/aac775b5-de4c-42b5-bb9e-016dce33a177.png)

**Developer Guide**
![image.png](https://raw.githubusercontent.com/Runus01/ped/main/files/ae16fe52-feb8-4944-ae05-1fed537d0118.png)

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Missing full stop in user guide and developer guide #9

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Missing full stop in user guide and developer guide #9

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