📚 Minor typo in `cross-referencing.md` #1745

Job	Run time
Check myst-docutils install (0.19)	12s
Check myst-docutils install (0.20)	11s
pytest: py3.10, sphinx>=8,<9, on ubuntu-latest	34s
pre-commit	16s
Check myst-docutils install (0.21)	13s
pytest: py3.11, sphinx>=8,<9, on ubuntu-latest	29s
pytest: py3.12, sphinx>=8,<9, on ubuntu-latest	39s
pytest: py3.13, sphinx>=8,<9, on ubuntu-latest	43s
pytest: py3.10, sphinx>=7,<8, on ubuntu-latest	37s
pytest: py3.10, sphinx>=7,<8, on windows-latest	1m 19s
check	3s
Publish myst-parser to PyPi	0s
Publish myst-docutils to PyPi	0s
	5m 16s

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