docs: minor improvements

Author: Rel1cx

apps/website/content/docs/rules/overview.mdx

@@ -70,7 +70,7 @@ full: true
 | [`no-set-state-in-component-did-update`](./no-set-state-in-component-did-update)     | 1️⃣ |           | Disallow calling `this.setState` in `componentDidUpdate` outside of functions, such as callbacks    |          |
 | [`no-set-state-in-component-will-update`](./no-set-state-in-component-will-update)   | 1️⃣ |           | Disallow calling `this.setState` in `componentWillUpdate` outside of functions, such as callbacks   |          |
 | [`no-string-refs`](./no-string-refs)                                                 | 2️⃣ |    `🔄`   | Replaces string refs with callback refs                                                             | >=16.3.0 |
-| [`no-unnecessary-key`](./no-unnecessary-key)                                         | 0️⃣ |    `🧪`   | Prevents the use of unnecessary `key` props on JSX elements when rendering lists                    |          |
+| [`no-unnecessary-key`](./no-unnecessary-key)                                         | 0️⃣ |    `🧪`   | Prevents `key` from being placed on non-top-level elements in a list rendering                      |          |
 | [`no-unnecessary-use-callback`](./no-unnecessary-use-callback)                       | 0️⃣ |    `🧪`   | Disallow unnecessary usage of `useCallback`                                                         |          |
 | [`no-unnecessary-use-memo`](./no-unnecessary-use-memo)                               | 0️⃣ |    `🧪`   | Disallow unnecessary usage of `useMemo`                                                             |          |
 | [`no-unnecessary-use-prefix`](./no-unnecessary-use-prefix)                           | 0️⃣ |           | Enforces that a function with the `use` prefix should use at least one Hook inside of it            |          |

packages/plugins/eslint-plugin-react-x/src/rules/no-duplicate-key.mdx

@@ -130,3 +130,5 @@ function MyComponent() {
   Prevents `key` from not being explicitly specified (e.g. spreading `key` from objects).
 - [`no-array-index-key`](./no-array-index-key)\
   Warns when an array `index` is used as a `key` prop.
+- [`no-unnecessary-key`](./no-unnecessary-key)\
+  Prevents `key` from being placed on non-top-level elements in a list rendering.

packages/plugins/eslint-plugin-react-x/src/rules/no-unnecessary-key.mdx

@@ -20,7 +20,7 @@ react-x/no-unnecessary-key
 
 ## Description
 
-This rule prevents the use of unnecessary `key` props on JSX elements when rendering lists.
+This rule prevents `key` from being placed on non-top-level elements in a list rendering.
 
 When rendering a list of elements in React, the `key` prop should only be placed on the outermost element for each item in the list. Adding keys to nested child elements is redundant, can cause confusion, and may lead to subtle bugs during refactoring.
 
@@ -47,13 +47,6 @@ things.map(thing => (
     <div>{thing.description}</div>
   </React.Fragment>
 ))
-
-// This also applies to array literals
-const elements = [
-  <div key="1">
-    <span key="child-span">Item 1</span> {/* 🚨 This key is unnecessary */}
-  </div>
-];
 ```
 
 ### Passing
@@ -70,9 +63,6 @@ things.map(thing => (
   </React.Fragment>
 ))
 
-// Keys on top-level elements in an array literal are correct
-const elements = [<div key="1" />, <div key="2" />];
-
 // Static keys used to re-mount components are not affected by this rule,
 // as they are not inside a list rendering context.
 function ComponentWithStaticKey() {
@@ -103,3 +93,5 @@ function ComponentWithStaticKey() {
   Prevents `key` from not being explicitly specified (e.g. spreading `key` from objects).
 - [`no-array-index-key`](./no-array-index-key)\
   Warns when an array `index` is used as a `key` prop.
+- [`no-duplicate-key`](./no-duplicate-key)\
+  Prevents duplicate `key` props within the same list.