“sa va” is a common French spelling error.
The reviewed standard spelling is “ça va.” The suggestion remains optional because lyrics can preserve intentional forms.
Example
[Couplet]
Je sais, sa va[Couplet]
Je sais, ça vaThe fix
In the workbench this finding carries one control, labelled Replace with ça va. The change is contextual, so it is previewed as a diff in your document first and applies only when you confirm it.
Sources
The guidelines this rule enforces, as cited on every finding it reports:
Ça verified Demonstrative-pronoun spellings in ça va and comme ça
Questions d’orthographe lexicales verified Frequent lexical errors including acceuil and parmis
Les erreurs fréquentes liées aux consonnes doubles verified Standard spellings with single and doubled consonants