Add docs for troubleshooting the libxml2 mismatch issue #734

Job	Run time
cache_libs / cache_libs (ubuntu-22.04-arm)	19s
cache_libs / cache_libs (windows-11-arm)	36s
cache_libs / cache_libs (windows-2022)	30s
cache_libs / cache_libs (ubuntu-22.04)	12s
cache_libs / cache_libs (macos-latest)	13s
manylinux (cp312-cp312, manylinux_2_28_x86_64)	3m 46s
manylinux (cp312-cp312, musllinux_1_2_x86_64)	3m 55s
manylinux (cp314-cp314, manylinux2014_x86_64)	3m 27s
manylinux (cp39-cp39, musllinux_1_2_x86_64)	4m 1s
manylinux (cp313-cp313, musllinux_1_2_x86_64)	4m 0s
manylinux (cp311-cp311, musllinux_1_2_x86_64)	4m 3s
manylinux (cp312-cp312, manylinux2014_x86_64)	3m 28s
manylinux (cp310-cp310, manylinux_2_28_x86_64)	3m 50s
manylinux (cp313-cp313, manylinux2014_x86_64)	3m 20s
manylinux (cp314-cp314, musllinux_1_2_x86_64)	3m 57s
manylinux (cp314-cp314, manylinux_2_28_x86_64)	3m 28s
manylinux (cp311-cp311, manylinux2014_x86_64)	3m 21s
manylinux (cp310-cp310, musllinux_1_2_x86_64)	3m 55s
manylinux (cp39-cp39, manylinux2014_x86_64)	3m 19s
manylinux (cp313-cp313, manylinux_2_28_x86_64)	3m 44s
manylinux (cp311-cp311, manylinux_2_28_x86_64)	3m 45s
manylinux (cp310-cp310, manylinux2014_x86_64)	3m 18s
manylinux (cp39-cp39, manylinux_2_28_x86_64)	3m 48s
	1h 8m 15s

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