Fix usage comment of alt() combinator
Looks like `|` is a leftover from the old macro-based API.
@@ -26,7 +26,7 @@ Those are used to recognize the lowest level elements of your grammar, like, "he
| combinator | usage | input | output | comment |
|---|---|---|---|---|
-| [alt](https://docs.rs/nom/latest/nom/branch/fn.alt.html) | `alt(tag("ab") \| tag("cd"))` | `"cdef"` | `Ok(("ef", "cd"))` |Try a list of parsers and return the result of the first successful one|
+| [alt](https://docs.rs/nom/latest/nom/branch/fn.alt.html) | `alt(tag("ab"), tag("cd"))` | `"cdef"` | `Ok(("ef", "cd"))` |Try a list of parsers and return the result of the first successful one|
| [permutation](https://docs.rs/nom/latest/nom/branch/fn.permutation.html) | `permutation(tag("ab"), tag("cd"), tag("12"))` | `"cd12abc"` | `Ok(("c", ("ab", "cd", "12"))` |Succeeds when all its child parser have succeeded, whatever the order|
## Sequence combinators
