Remove trailing whitespace from `lsp-describe-thing-at-point' (#4576) #5440

Job	Run time
test (ubuntu-latest, 27.2, false)	2m 2s
test (ubuntu-latest, 28.2, false)	2m 41s
test (ubuntu-latest, 29.4, false)	3m 1s
test (macos-latest, 28.2, false)	5m 18s
test (macos-latest, 29.4, false)	3m 55s
test (windows-latest, 27.2, false)	2m 51s
test (windows-latest, 28.2, false)	3m 30s
test (windows-latest, 29.4, false)	3m 18s
test (ubuntu-latest, snapshot, true)	1m 22s
test (macos-latest, snapshot, true)	2m 50s
test (windows-latest, snapshot, true)	5m 16s
	36m 4s

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