chore(timer.f90): cleanup docstrings in Timer utility #1917

Job	Run time
Build	1m 23s
Check format	2m 23s
Smoke test	3m 55s
Test intel fortran (ubuntu-22.04, intel-classic, 2021.7)	25m 29s
Parallel testing (ubuntu-22.04)	10m 54s
Test gnu fortran (ubuntu-22.04)	24m 35s
Parallel testing (macos-12)	18m 56s
Test intel fortran (macos-12, intel-classic, 2021.7)	25m 35s
Test gnu fortran (macos-12)	31m 23s
Test intel fortran (windows-2022, intel-classic, 2021.7)	32m 35s
Test gnu fortran (windows-2022)	34m 17s
	3h 31m 25s

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