Update platform configurations in OpenCPI briefings
### Location of documents
https://gitlab.com/opencpi/opencpi/-/tree/develop/doc/briefings
### Problem identified
Some of the OpenCPI briefings (formatted in LibreOffice presentation format (*.fodp)) describe case studies and configurations using older hardware platform configurations like Matchstiq-Z1 and Lime Microsystems. The following briefings need to be investigated for whether their case studies need to be updated to describe more recently supported hardware platforms, like plutosdr, zed, fmcomms3:
- Briefing 11, "Introduction to OpenCPI Platform Development"
https://gitlab.com/opencpi/opencpi/-/blob/develop/doc/briefings/Briefing_11_Platform_Development.fodp
- Briefing 12, "Device Support for FPGA Platforms"
https://gitlab.com/opencpi/opencpi/-/blob/develop/doc/briefings/Briefing_12_Device_Support_for_FPGA_Platforms.fodp
- Briefing 13, "Advanced OpenCPI Platform Development"
https://gitlab.com/opencpi/opencpi/-/blob/develop/doc/briefings/Briefing_13_Advanced_Platform_Development.fodp
Briefing 14, "Digital Radio Controller" should also be checked to make sure it reflects current OpenCPI best practice.
https://gitlab.com/opencpi/opencpi/-/blob/develop/doc/briefings/Briefing_14_Digital_Radio_Controller.fodp
### Proposed solution/workaround
- Identify slides in affected briefings where platforms need to be updated to current practice
- Decide on appropriate replacement platforms
- Edit and/or redraw affected LibreOffice Presentation slides to illustrate concepts using selected platforms
### Acceptance criteria
LibreOffice *.fodp briefings show current platform configurations and can be exported as PDF for viewing. The doc generator for the OpenCPI website opencpi.gitlab.io can successfully generate PDF versions of them.
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