nicer user-visible string

src/behavior-considered-undefined.md

@@ -1,4 +1,4 @@
-## Behavior considered undefined
+/## ndingBehavior considered undefined
 
 Rust code is incorrect if it exhibits any of the behaviors in the following
 list. This includes code within `unsafe` blocks and `unsafe` functions.
@@ -75,7 +75,8 @@ Please read the [Rustonomicon] before writing unsafe code.
 * Violating assumptions of the Rust runtime. This is only possible using
   mechanisms outside Rust. Most assumptions of the Rust runtime are currently
   not explicitly documented.
-  * For assumptions specifically related to unwinding, see [unwinding-ffi].
+  * For assumptions specifically related to unwinding, see the [panic
+    documentation][unwinding-ffi].
   * The runtime assumes that a Rust stack frame is not deallocated without
     executing destructors for local variables owned by the stack frame. This assumption
     can be violated by C functions like `longjmp`.