use U+27E8/27E9 (mathematical angle bracket) for langle/rangle, instead of U+2329/232A (angle bracket), as the former are recommended by Unicode for math & technical usage

Author: stevengj

base/latex_symbols.jl

@@ -559,8 +559,8 @@ const latex_symbols = [
     "\\lrcorner" => "⌟",
     "\\frown" => "⌢",
     "\\smile" => "⌣",
-    "\\langle" => "〈",
-    "\\rangle" => "〉",
+    "\\langle" = "⟨",
+    "\\rangle" => "⟩",
     "\\obar" => "⌽",
     "\\Elzdlcorn" => "⎣",
     "\\lmoustache" => "⎰",