Add U-shaped arrows (#4807)

crates/typst/src/symbols/sym.rs

@@ -639,6 +639,7 @@ pub(crate) const SYM: &[(&str, Symbol)] = symbols! {
         r.long.bar: '⟼',
         r.bar: '↦',
         r.curve: '⤷',
+        r.turn: '⮎',
         r.dashed: '⇢',
         r.dotted: '⤑',
         r.double: '⇒',
@@ -665,6 +666,7 @@ pub(crate) const SYM: &[(&str, Symbol)] = symbols! {
         #[call(crate::math::accent::arrow_l)] l: '←',
         l.bar: '↤',
         l.curve: '⤶',
+        l.turn: '⮌',
         l.dashed: '⇠',
         l.dotted: '⬸',
         l.double: '⇐',
@@ -692,6 +694,7 @@ pub(crate) const SYM: &[(&str, Symbol)] = symbols! {
         t: '↑',
         t.bar: '↥',
         t.curve: '⤴',
+        t.turn: '⮍',
         t.dashed: '⇡',
         t.double: '⇑',
         t.filled: '⬆',
@@ -703,6 +706,7 @@ pub(crate) const SYM: &[(&str, Symbol)] = symbols! {
         b: '↓',
         b.bar: '↧',
         b.curve: '⤵',
+        b.turn: '⮏',
         b.dashed: '⇣',
         b.double: '⇓',
         b.filled: '⬇',