fix: grammar

Co-authored-by: Mikołaj Szydłowski <9szydlowski9@gmail.com>

Author: hejsztynx

ios/styles/ItalicStyle.mm

@@ -61,7 +61,7 @@ - (void)applyStyling:(NSRange)range {
 }
 
 // some styles might apply a new font (inline code), so we need to apply
-// the italic last, that way knowing if the used font supports italics
+// the italic last, that way we know if the used font supports italics
 // or we need to apply a slant
 - (NSInteger)stylePriority {
   return 3;