Add ;:? to keybar and help

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+*View this file with results and syntax highlighting [here](https://mlochbaum.github.io/BQN/help/nextbody.html).*
+
+# Semicolon (`;`)
+
+## `;`: Next Body
+[→full documentation](../doc/block.md#multiple-bodies)
+
+End the current block body and start a new one. [Headers](header.md) (`:`) and [predicates](predicate.md) (`?`) can control which body is evaluated. A function can have two headers without these, indicating the monadic and dyadic cases.
+
+        3 { 𝕩÷2 ; -𝕨‿𝕩 } 4   # Monadic and dyadic cases
+
+        F ← {𝕊a‿b: a-b; 𝕊a‿b‿c: b+c}
+
+        F 5‿2                # Matches first header
+
+        F 1‿3‿6              # Matches second header