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docs: Reword last bullet point of thread safety guarantees #282

Job	Run time
ubuntu cmake	35s
ubuntu (g++, standard)	1m 10s
macos cmake	20s
windows (Win32, standard)	1m 55s
windows (Win32, PUGIXML_WCHAR_MODE)	2m 14s
windows (Win32, PUGIXML_COMPACT)	1m 46s
windows (Win32, PUGIXML_NO_EXCEPTIONS)	1m 57s
ubuntu (g++, PUGIXML_WCHAR_MODE)	1m 8s
windows (x64, standard)	1m 43s
ubuntu (g++, PUGIXML_COMPACT)	1m 13s
windows (x64, PUGIXML_WCHAR_MODE)	1m 43s
ubuntu (g++, PUGIXML_NO_EXCEPTIONS)	1m 4s
windows (x64, PUGIXML_COMPACT)	1m 57s
ubuntu (clang++, standard)	49s
windows (x64, PUGIXML_NO_EXCEPTIONS)	1m 17s
ubuntu (clang++, PUGIXML_WCHAR_MODE)	52s
ubuntu (clang++, PUGIXML_COMPACT)	53s
ubuntu (clang++, PUGIXML_NO_EXCEPTIONS)	52s
macos (clang++, standard)	44s
macos (clang++, PUGIXML_WCHAR_MODE)	47s
macos (clang++, PUGIXML_COMPACT)	57s
macos (clang++, PUGIXML_NO_EXCEPTIONS)	55s
	26m 51s

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