pep695: add typescript information

Author: KotlinIsland

pep-0695.rst

@@ -961,7 +961,8 @@ combined with other type operators such as "keyof".
 TypeScript uses declaration-site variance. Variance is inferred from
 usage, not specified explicitly. TypeScript 4.7 introduced the ability
 to specify variance using "in" and "out" keywords. This was added to handle
-extremely complex types where inference of variance was expensive.
+extremely complex types where inference of variance was expensive,
+yet the maintainers state that is useful for increasing readability.
 
 A default type argument can be specified using the "=" operator.