8be36b1b3a
Improve grammar in documentation of format strings
The docs previously were
* using some weird `<` and `>` around some nonterminals
* _correct me if these **did** have any meaning_
* using of a (not explicitly defined) `text` nonterminal that didn’t explicitly disallow productions containing `'{'` or `'}'`
* incorrect in not allowing for `x?` and `X?` productions of `type`
* unnecessarily ambiguous, both
* allowing `type` to be `''`, and
* using an optional `[type]`
* using inconsistent underscore/hyphenation style between `format_string` and `format_spec` vs `maybe-format`
_Rendered:_
_(current docs: https://doc.rust-lang.org/nightly/std/fmt/#syntax)_
```@rustbot``` modify labels: T-doc
|
||
|---|---|---|
| .. | ||
| benches | ||
| src | ||
| tests | ||
| Cargo.toml | ||
