[docs] fix broken links #7533

Job	Run time
r-package (ubuntu-latest, gcc, R 3.6, cmake)	9m 37s
r-package (debian, R-devel, clang)	19m 26s
r-package (ubuntu-latest, gcc, R 4.3, cmake)	16m 45s
r-package (ubuntu-latest, clang, R 3.6, cmake)	9m 2s
r-sanitizers (ubuntu-latest, R-devel, gcc ASAN/UBSAN)	21m 2s
r-package (ubuntu-latest, clang, R 4.3, cmake)	17m 8s
r-sanitizers (ubuntu-latest, R-devel, clang ASAN/UBSAN)	38m 6s
r-package (macOS-latest, gcc, R 4.3, cmake)	14m 31s
r-package (macOS-latest, clang, R 4.3, cmake)	13m 39s
r-package (windows-latest, MINGW, R 3.6, cmake)	17m 49s
r-package (windows-latest, MINGW, R 4.3, cmake)	21m 40s
r-package (windows-2019, MSVC, R 3.6, cmake)	16m 46s
r-package (windows-2022, MSVC, R 4.3, cmake)	20m 57s
r-package (windows-latest, MINGW, R 3.6, cran)	33m 6s
r-package (windows-latest, MINGW, R 4.3, cran)	23m 29s
r-package (ubuntu-latest, gcc, R 4.3, cran)	24m 47s
r-package (macOS-latest, clang, R 4.3, cran)	18m 54s
r-rchk (ubuntu-latest, gcc, R 4.3, cran)	16m 1s
all-r-package-jobs-successful	3s
	5h 52m 48s

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