[FTheoryTools] Fix LaTeX super indices in documentation #17176

Job	Run time
test (1.6, short, ubuntu-latest)	1h 29m 5s
test (1.6, long, ubuntu-latest)	56m 3s
test (1.10, short, ubuntu-latest)	1h 7m 59s
test (1.10, long, ubuntu-latest)	52m 15s
test (1.11-nightly, short, ubuntu-latest)	1h 21m 28s
test (1.11-nightly, long, ubuntu-latest)	52m 48s
doctest (1.10, ubuntu-latest)	25m 17s
test (nightly, short, ubuntu-latest)	1h 24m 19s
doctest (1.11-nightly, ubuntu-latest)	26m 25s
test (nightly, long, ubuntu-latest)	59m 7s
doctest (nightly, ubuntu-latest)	30m 27s
test (1.10, short, ubuntu-latest, depwarn=error)	1h 9m 24s
doctest (1.10, ubuntu-latest, depwarn=error)	25m 17s
test (1.10, long, ubuntu-latest, depwarn=error)	50m 8s
doctest (1.10, macOS, RPTU)	13m 23s
test (1.10, short, macOS, RPTU)	14m 6s
test (1.10, long, macOS, RPTU)	14m 30s
test (1.10, book, ubuntu-latest)	48m 29s
test (nightly, book, ubuntu-latest)	59m 15s
	15h 19m 45s

Provide feedback