Instant/SystemTime doc: add meaning to first line
The first line (paragraph?) of a doc-comment is what rustdoc shows when listing items of a module. What makes `Instant` and `SystemTime` different is important enough to be there. (Though feel free to bikeshed the wording.)
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@ -22,7 +22,8 @@ pub use self::duration::Duration;
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mod duration;
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/// A measurement of a monotonically increasing clock.
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/// A measurement of a monotonically increasing clock,
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/// only meaningful within one process.
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///
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/// Instants are always guaranteed to be greater than any previously measured
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/// instant when created, and are often useful for tasks such as measuring
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@ -42,8 +43,8 @@ mod duration;
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#[unstable(feature = "time2", reason = "recently added", issue = "29866")]
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pub struct Instant(time::Instant);
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/// A measurement of the system clock appropriate for timestamps such as those
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/// on files on the filesystem.
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/// A measurement of the system clock appropriate for timestamps meaningful
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/// outside one process, such as those on files on the filesystem.
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///
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/// Distinct from the `Instant` type, this time measurement **is not
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/// monotonic**. This means that you can save a file to the file system, then
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