Fix typos `ucom` → `ucom` #5890

Job	Run time
style checks	2m 19s
build (ubuntu-latest, x86_64-unknown-linux-gnu)	48m 56s
build (macos-latest, x86_64-apple-darwin)	23m 25s
build (windows-latest, i686-pc-windows-msvc)	34m 28s
cronjob failure notification	0s
bors build finished	0s
bors build finished	0s
	1h 49m 8s

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