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docs: Add deprecation notice to getn/foreach/foreachi (#849) 

RFC:
https://github.com/Roblox/luau/blob/master/rfcs/deprecate-table-getn-foreach.md
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Arseny Kapoulkine 2023-02-27 12:30:23 -08:00 committed by GitHub
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@ -374,19 +374,19 @@ Concatenate all elements of `a` with indices in range `[f..t]` together, using `
function table.foreach<K, V, R>(t: { [K]: V }, f: (K, V) -> R?): R?
```
Iterates over all elements of the table in unspecified order; for each key-value pair, calls `f` and returns the result of `f` if it's non-nil. If all invocations of `f` returned `nil`, returns no values.
Iterates over all elements of the table in unspecified order; for each key-value pair, calls `f` and returns the result of `f` if it's non-nil. If all invocations of `f` returned `nil`, returns no values. This function has been deprecated and is not recommended for use in new code; use `for` loop instead.
```
function table.foreachi<V, R>(t: {V}, f: (number, V) -> R?): R?
```
Iterates over numeric keys of the table in `[1..#t]` range in order; for each key-value pair, calls `f` and returns the result of `f` if it's non-nil. If all invocations of `f` returned `nil`, returns no values.
Iterates over numeric keys of the table in `[1..#t]` range in order; for each key-value pair, calls `f` and returns the result of `f` if it's non-nil. If all invocations of `f` returned `nil`, returns no values. This function has been deprecated and is not recommended for use in new code; use `for` loop instead.
```
function table.getn<V>(t: {V}): number
```
Returns the length of table `t` (equivalent to `#t`).
Returns the length of table `t`. This function has been deprecated and is not recommended for use in new code; use `#t` instead.
```
function table.maxn<V>(t: {V}): number