Rollup merge of #48856 - Songbird0:improve_line_macro_documentation, r=joshtriplett

Modify part of `line!` documentation.

In accordance with #46997, I've replaced:

> The returned line is not the invocation of the line! macro itself [...]

By

> The returned line is *not necessarily* the line of the `line!` invocation itself [...]
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Manish Goregaokar 2018-03-08 17:25:58 -08:00 committed by GitHub
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@ -472,7 +472,7 @@ pub mod builtin {
/// The expanded expression has type `u32` and is 1-based, so the first line
/// in each file evaluates to 1, the second to 2, etc. This is consistent
/// with error messages by common compilers or popular editors.
/// The returned line is not the invocation of the `line!` macro itself,
/// The returned line is *not necessarily* the line of the `line!` invocation itself,
/// but rather the first macro invocation leading up to the invocation
/// of the `line!` macro.
///