Update src/const_eval.md

Co-Authored-By: chriskrycho <hello@chriskrycho.com>

Author: Centril

src/const_eval.md

@@ -12,7 +12,7 @@ expressions, and are always evaluated at compile time. In other places, such as
 [`let` statements](statements.html#let-statements), constant expressions are
 Errors such as out of bounds [array indexing] or [overflow] are compiler errors
 if the value must be evaluated at compile time (i.e. in const contexts);
-otherwise they are just warnings, but the code will most likely panic when run.
+Otherwise, these behaviors are warnings, but will likely panic at run-time.
 
 The following expressions are constant expressions, so long as any operands are
 also constant expressions and do not cause any [`Drop::drop`][destructors] calls