Remove a few unnecessary lifetimes

    warning: unused imports: `parse_concise_float`, `parse_truncated_float`
      --> tests/../src/lexical/mod.rs:38:23
       |
    38 | pub use self::parse::{parse_concise_float, parse_truncated_float};
       |                       ^^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^^^
       |
       = note: `#[warn(unused_imports)]` on by default

    warning: unused import: `std::vec::Vec`
      --> tests/lexical.rs:30:13
       |
    30 |     pub use std::vec::Vec;
       |             ^^^^^^^^^^^^^

    warning: unused imports: `cmp`, `iter`, `mem`, `ops`
      --> tests/lexical.rs:31:19
       |
    31 |     pub use std::{cmp, iter, mem, ops};
       |                   ^^^  ^^^^  ^^^  ^^^

Add test of negative NaN and negative infinity

Fixed some typos

Improve Value From and FromIterator docs