Add parameter names to markers in documentation

[iqmtestd]

Markers for annotating auto-generated images in documentation now may have one more argument, the name of the parameter. This will also be shown in the image.

Fix #53

[github-actions[bot]]

Test results

       5 files  ±0         5 suites  ±0   4m 25s :stopwatch: +38s    308 tests ±0     308 :heavy_check_mark: ±0  0 :zzz: ±0  0 :x: ±0  1 540 runs  ±0  1 540 :heavy_check_mark: ±0  0 :zzz: ±0  0 :x: ±0 

Results for commit dcc6f7d6. ± Comparison against base commit 0a6f5817.