docs: Fix broken util links (#907)

* Fix broken links

* Fix broken doc links

Co-authored-by: Eugene Zaretskiy <ezaretskiy@attentivemobile.com>

Author: EugeneZ

docs/api/utils.mdx

@@ -8,79 +8,79 @@ This is an overview over atom creators/hooks utilities that can found under `jot
 
 ## Overview
 
-1. [atomWithStorage](../utils/atom-with-storage)
+1. [atomWithStorage](../utils/atom-with-storage.mdx)
 
    The `atomWithStorage` function creates an atom with a value persisted in `localStorage` or `sessionStorage` for React or `AsyncStorage` for React Native.
 
-2. [atomWithObservable](../utils/atom-with-observable)
+2. [atomWithObservable](../utils/atom-with-observable.mdx)
 
    The `atomWithObservable` function creates an atom from a rxjs (or similar) `subject` or `observable`. Its value will be last value emitted from the stream.
 
-3. [useUpdateAtom](../utils/use-update-atom)
+3. [useUpdateAtom](../utils/use-update-atom.mdx)
 
    Use `useUpdateAtom` and write-only atoms to avoid re-render.
 
-4. [useAtomValue](../utils/use-atom-value)
+4. [useAtomValue](../utils/use-atom-value.mdx)
 
    Returns the value of the given atom.
 
-5. [atomWithReset](../utils/atom-with-reset)
+5. [atomWithReset](../utils/atom-with-reset.mdx)
 
    Creates an atom that could be reset to its `initialValue` with `useResetAtom` hook.
 
-6. [useResetAtom](../utils/use-reset-atom)
+6. [useResetAtom](../utils/use-reset-atom.mdx)
 
    Resets a Resettable atom to its initial value.
 
-7. [RESET](../utils/reset)
+7. [RESET](../utils/reset.mdx)
 
    Special value that is accepted by Resettable atoms created with `atomWithReset`, `atomWithDefault` or writable atom created with atom if it accepts `RESET` symbol.
 
-8. [useReducerAtom](../utils/use-reducer-atom)
+8. [useReducerAtom](../utils/use-reducer-atom.mdx)
 
    Use this hook to update an atom value with a reducer function.
 
-9.  [atomWithReducer](../utils/atom-with-reducer)
+9.  [atomWithReducer](../utils/atom-with-reducer.mdx)
 
     This is a function to create an atom with an embeded reducer function to update the value.
 
-10. [atomWithDefault](../utils/atom-with-default)
+10. [atomWithDefault](../utils/atom-with-default.mdx)
 
     This is a function to create an overwritable primitive atom. Its default value can be specified with a read function instead of a static initial value.
 
-11. [atomWithHash](../utils/atom-with-hash)
+11. [atomWithHash](../utils/atom-with-hash.mdx)
 
     This creates a new atom that is connected with URL hash.
 
-12. [atomFamily](../utils/atom-family)
+12. [atomFamily](../utils/atom-family.mdx)
 
     This will create a function that takes param and returns an atom.
 
-13. [selectAtom](../utils/select-atom)
+13. [selectAtom](../utils/select-atom.mdx)
 
     This function creates a derived atom whose value is a function of the original atom's value, determined by `selector`.
 
-14. [useAtomCallback](../utils/use-atom-callback)
+14. [useAtomCallback](../utils/use-atom-callback.mdx)
 
     This hook allows to interact with atoms imperatively.
 
-15. [freezeAtom](../utils/freeze-atom)
+15. [freezeAtom](../utils/freeze-atom.mdx)
 
     The `freezeAtom` takes an existing atom and returns a new derived atom. The value with the new derived atom will be frozen (= not mutable).
 
-16. [freezeAtomCreator](../utils/freeze-atom-creator)
+16. [freezeAtomCreator](../utils/freeze-atom-creator.mdx)
 
     Instead of create a frozen atom from an existing atom, `freezeAtomCreator` takes an atom creator function and returns a new function.
 
-17. [splitAtom](../utils/split-atom)
+17. [splitAtom](../utils/split-atom.mdx)
 
     The `splitAtom` utility is useful for when you want to get an atom for each element in a list.
 
-18. [waitForAll](../utils/wait-for-all)
+18. [waitForAll](../utils/wait-for-all.mdx)
 
     The `waitForAll` utility is a concurrency helper, which allows us to evaluate multiple async atoms.
 
-19. [useHydrateAtoms](../utils/use-hydrate-atoms)
+19. [useHydrateAtoms](../utils/use-hydrate-atoms.mdx)
 
     The primary use case for `useHydrateAtoms` are SSR apps like Next.js, where an initial value is e.g. fetched on the server, which can be passed to a component by props.