[CLEANUP] Make the Markdown code highlighting consistent #2283

Job	Run time
Composer Validate (8.3)	6s
PHP Lint (7.3)	14s
PHP Lint (7.4)	19s
PHP Lint (8.0)	19s
PHP Lint (8.1)	18s
PHP Lint (8.2)	7s
PHP Lint (8.3)	7s
PHP Lint (8.4)	8s
Static Analysis (composer:normalize, 8.3)	18s
Unit tests (7.3, lowest)	11s
Static Analysis (php:fixer, 8.3)	27s
Unit tests (7.3, highest)	10s
Static Analysis (php:md, 8.3)	17s
Unit tests (7.4, lowest)	19s
Static Analysis (php:stan, 8.3)	33s
Unit tests (7.4, highest)	14s
Unit tests (8.0, lowest)	23s
Unit tests (8.0, highest)	11s
Unit tests (8.1, lowest)	12s
Unit tests (8.1, highest)	11s
Unit tests (8.2, lowest)	27s
Unit tests (8.2, highest)	14s
Unit tests (8.3, lowest)	13s
Unit tests (8.3, highest)	12s
Unit tests (8.4, lowest)	23s
Unit tests (8.4, highest)	31s
	7m 4s

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