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doc: add global variables link (#16228)

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@ -343,11 +343,12 @@ the expression `T(v)` converts the value `v` to the
type `T`.
Unlike most other languages, V only allows defining variables in functions.
Global (module level) variables are not allowed. There's no global state in V.
By default V does not allow **global variables**. See more [details](#global-variables).
For consistency across different code bases, all variable and function names
must use the `snake_case` style, as opposed to type names, which must use `PascalCase`.
### Mutable variables
```v