Simplify CString doc comment
No need for `&b"foo"[..]` to make a CString, `"foo"` will do.
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@ -53,8 +53,7 @@ use vec::Vec;
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/// fn my_printer(s: *const libc::c_char);
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/// }
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///
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/// let to_print = &b"Hello, world!"[..];
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/// let c_to_print = CString::new(to_print).unwrap();
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/// let c_to_print = CString::new("Hello, world!").unwrap();
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/// unsafe {
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/// my_printer(c_to_print.as_ptr());
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/// }
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