Rephrase errors for numbers that must be unitless or % #1174

Job	Run time
Static analysis	28s
Unit tests	44s
Lint spec files	32s
Language \| LibSass	3m 53s
Language \| Dart Sass \| Dart ${{ matrix.dart_channel }}	0s
JS API \| Pure JS \| Node ${{ matrix.node_version }} \| ${{ matrix.os }}	0s
JS API \| Pure JS \| Browser	0s
JS API \| Embedded \| Node 18 \| ubuntu-latest	7m 25s
JS API \| Embedded \| Node 18 \| windows-latest	9m 38s
JS API \| Embedded \| Node 18 \| macos-latest	9m 43s
JS API \| Embedded \| Node 14 \| ubuntu-latest	7m 5s
JS API \| Embedded \| Node 16 \| ubuntu-latest	6m 43s
	46m 11s

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