[TASK] Polish the git rebasing section in `CONTRIBUTING.md` #2341

Job	Run time
Composer Validate (8.3)	7s
PHP Lint (7.3)	11s
PHP Lint (7.4)	9s
PHP Lint (8.0)	8s
PHP Lint (8.1)	11s
PHP Lint (8.2)	11s
PHP Lint (8.3)	7s
PHP Lint (8.4)	11s
Unit tests (7.3, lowest)	13s
Static Analysis (composer:normalize, 8.3)	18s
Unit tests (7.3, highest)	13s
Unit tests (7.4, lowest)	13s
Static Analysis (php:fixer, 8.3)	31s
Unit tests (7.4, highest)	14s
Static Analysis (php:md, 8.3)	18s
Unit tests (8.0, lowest)	15s
Static Analysis (php:rector, 8.3)	24s
Unit tests (8.0, highest)	13s
Static Analysis (php:stan, 8.3)	35s
Unit tests (8.1, lowest)	13s
Unit tests (8.1, highest)	20s
Unit tests (8.2, lowest)	20s
Unit tests (8.2, highest)	20s
Unit tests (8.3, lowest)	13s
Unit tests (8.3, highest)	12s
Unit tests (8.4, lowest)	17s
Unit tests (8.4, highest)	13s
	6m 50s

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