doc: fix typos in Chung_Lu() docs #1624

Job	Run time
Build wheels on Linux (aarch64/musllinux)	0s
Build wheels on Linux (x86_64)	21m 32s
Build sdist and test extra dependencies	2m 31s
Build wheels on Linux (aarch64/manylinux)	0s
Build wheels on Linux (i686)	18m 4s
Build wheels on macOS (x86_64)	18m 27s
Build wheels for WebAssembly	8m 12s
Build wheels on macOS (arm64)	9m 24s
Build wheels on Windows (Win32)	12m 8s
Build with sanitizers for debugging purposes	4m 30s
Build wheels on Windows (x64)	28m 33s
	2h 3m 21s

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