Rename angle.right.sq to angle.right.square (#119)

Author: laurmaedje

src/modules/sym.txt

@@ -650,6 +650,8 @@ angle ∠
   .right.rev ⯾
   .right.arc ⊾
   .right.dot ⦝
+  .right.square ⦜
+  @deprecated: `angle.right.sq` is deprecated, use `angle.right.square` instead
   .right.sq ⦜
   .s ⦞
   .spatial ⟀