refactor(mf5to6,docs): fix doubled whitespace in 'internal factor' #3822

Job	Run time
Build	1m 54s
Check format	1m 18s
Smoke test	5m 24s
Extended testing (ubuntu-22.04)	17m 59s
Extended testing (macos-13)	38m 56s
Extended testing (windows-2022)	54m 16s
Test Intel fortran (ubuntu-22.04)	38m 45s
Test Intel fortran (macos-13)	24m 33s
Test GNU fortran (macos-13, false)	39m 4s
Test GNU fortran (macos-14, false)	29m 55s
Test Intel fortran (windows-2022)	34m 7s
Test GNU fortran (macos-14, true)	58m 46s
Test GNU fortran (ubuntu-22.04, false)	38m 27s
Test GNU fortran (ubuntu-22.04, true)	1h 30m 26s
Test GNU fortran (windows-2022, false)	47m 14s
	8h 41m 4s

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