Renaming single var names to something a little more meaningful #2173

Job	Run time
Labs (ubuntu-latest)	52s
Contrib scripts check	1m 10s
Labs-Slides	1m 4s
List-Courses	5s
Python scripts black lint check	6s
Slides (static_analysis_via_compiler)	1m 12s
Slides (fundamentals_of_ada)	8m 58s
Slides (gnat_project_facility)	1m 34s
Slides (gnat_studio)	1m 18s
Slides (toolchain)	1m 11s
Slides (gnatsas)	2m 22s
Slides (gnatdas)	2m 5s
Slides (spark_for_ada_programmers)	2m 53s
Slides (advanced_exception_analysis)	1m 5s
Slides (fundamentals_of_ada/opat.txt)	2m 4s
Slides (fundamentals_of_ada/standard_course.txt)	2m 7s
Slides (fundamentals_of_ada/advanced.txt)	1m 56s
Slides (gnat_project_facility/standard_course.txt)	1m 11s
Slides (gnat_studio/course.txt)	1m 21s
Slides (toolchain/gnat_toolchain.txt)	1m 22s
Slides (spark_for_ada_programmers/course.txt)	1m 33s
	37m 29s

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