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book: improve Vec intro #24866

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book: improve Vec intro #24866

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5 changes: 3 additions & 2 deletions src/doc/trpl/vectors.md
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% Vectors

A ‘vector’ is a dynamic or ‘growable’ array, implemented as the standard
library type [`Vec<T>`][vec]. That `<T>` is a [generic][generic], meaning we
can have vectors of any type. Vectors always allocate their data on the heap.
library type [`Vec<T>`][vec]. The `T` means that we can have vectors
of any type (see the chapter on [generics][generic] for more).
Vectors always allocate their data on the heap.
You can create them with the `vec!` macro:

```rust
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