[I] Add image to documentation.md

[via GitHub]

nicolasperivolaris opened a new issue, #3198:
URL: https://github.com/apache/streampipes/issues/3198

   ### Apache StreamPipes version
   
   dev (current development state)
   
   ### Affected StreamPipes components
   
   UI
   
   ### What happened?
   
   It's seams impossible to display image from the documentation.md file. 
   
   
![image](https://github.com/user-attachments/assets/df9ab0b3-c36b-4122-92f4-70fd16ed99b7)
   
   
   ### How to reproduce?
   
   Create a pipeline and add a Geo Buffer Point processor.
   Open the documentation for this processor.
   The bottom output picture doesn't show up.
   
   ### Expected behavior
   
   Image should be displayable in the documentation
   
   ### Additional technical information
   
   _No response_
   
   ### Are you willing to submit a PR?
   
   None


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