(document) add Oxford comma and drop count

Author: xzbdmw

gopls/doc/release/v0.17.0.md

@@ -30,5 +30,5 @@ Go release containing the symbol. For example, hovering over `errors.As` shows
 "Added in go1.13".
 
 ## Semantic token modifiers of top-level constructor of types
-The semantic tokens response now includes additional 12 modifiers for the top-level constructor of the type of each symbol: `interface`, `struct`, `signature`, `pointer`, `array`, `map`, `slice`, `chan`, `string`, `number`, `bool` and `invalid`. Editors may use this for syntax coloring.
+The semantic tokens response now includes additional modifiers for the top-level constructor of the type of each symbol: `interface`, `struct`, `signature`, `pointer`, `array`, `map`, `slice`, `chan`, `string`, `number`, `bool`, and `invalid`. Editors may use this for syntax coloring.