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docs: fix typo #306

Job	Run time
ubuntu cmake	14s
windows (Win32, standard)	1m 54s
macos cmake	15s
ubuntu (g++, standard)	1m 12s
windows (Win32, PUGIXML_WCHAR_MODE)	1m 16s
ubuntu (g++, PUGIXML_WCHAR_MODE)	1m 13s
windows (Win32, PUGIXML_COMPACT)	1m 1s
ubuntu (g++, PUGIXML_COMPACT)	1m 10s
windows (Win32, PUGIXML_NO_EXCEPTIONS)	1m 2s
ubuntu (g++, PUGIXML_NO_EXCEPTIONS)	1m 3s
windows (x64, standard)	1m 1s
ubuntu (clang++, standard)	53s
windows (x64, PUGIXML_WCHAR_MODE)	1m 2s
ubuntu (clang++, PUGIXML_WCHAR_MODE)	50s
ubuntu (clang++, PUGIXML_COMPACT)	56s
ubuntu (clang++, PUGIXML_NO_EXCEPTIONS)	48s
macos (clang++, standard)	42s
windows (x64, PUGIXML_COMPACT)	1m 57s
macos (clang++, PUGIXML_WCHAR_MODE)	44s
windows (x64, PUGIXML_NO_EXCEPTIONS)	1m 17s
macos (clang++, PUGIXML_COMPACT)	45s
macos (clang++, PUGIXML_NO_EXCEPTIONS)	49s
	22m 4s

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