Trivial MyST syntax enhancement #17373

Job	Run time
Core Basic (18.x)	6m 10s
Core Basic (20.x)	6m 14s
Core Blocks (18.x)	8m 47s
Core Blocks (20.x)	8m 30s
Core Blocks - Listing (18.x)	5m 7s
Core Blocks - Listing (20.x)	4m 51s
Core Content (18.x)	3m 1s
Core Control Panels (18.x)	4m 17s
Core Content (20.x)	2m 52s
Core Volto Slate (18.x)	7m 22s
Core Control Panels (20.x)	5m 15s
Core Volto Slate (20.x)	8m 2s
Core Basic - Plone 5 (18.x)	6m 23s
Deployment Mode (18.x)	6m 54s
Coresandbox (18.x)	6m 47s
Project Generator (18.x)	6m 52s
Multilingual in Deployment Mode (18.x)	3m 14s
Project Generator (20.x)	6m 42s
Multilingual (18.x)	3m 33s
Working Copy (18.x)	3m 12s
	1h 54m 5s

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