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Document span_ext (#1098)

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`<gsl/span>` is intended to mirror `<span>` in the STL. `<span_ext>` provides convenience features that aren't part of `<span>`.
Address #1095
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@ -599,7 +599,7 @@ Converts a `span` into a `span` of `byte`s.
## <a name="H-span_ext" />`<span_ext>`
This files is a companion for and included by [`<span>`](#user-content-H-span).
This file is a companion for and included by [`<gsl/span>`](#user-content-H-span), and should not be used on its own. It contains useful features that aren't part of the `std::span` API as found inside the STL `<span>` header (with the exception of [`gsl::dynamic_extent`](#user-content-H-span_ext-dynamic_extent), which is included here due to implementation constraints).
- [`gsl::dynamic_extent`](#user-content-H-span_ext-dynamic_extent)
- [`gsl::span`](#user-content-H-span_ext-span)
@ -611,7 +611,9 @@ This files is a companion for and included by [`<span>`](#user-content-H-span).
### <a name="H-span_ext-dynamic_extent" />`gsl::dynamic_extent`
Defines the extent value to be used by all `gsl::span` with dynamic extent.
Defines the extent value to be used by all `gsl::span` with dynamic extent.
Note: `std::dynamic_extent` is exposed by the STL `<span>` header and so ideally `gsl::dynamic_extent` would be under [`<gsl/span>`](#user-content-H-span), but to avoid cyclic dependency issues it is under `<span_ext>` instead.
### <a name="H-span_ext-span" />`gsl::span`