Update inaccurate mapChildren comment (#18931)

rickyvetter · web-flow · commit 121af3143c71 · 2020-05-15T18:05:08.000+01:00
The function you provide will only be passed a child and an index. It will not be passed a key. This is confirmed in the source, the Flow types, and the jsdoc comments.
diff --git a/packages/react/src/ReactChildren.js b/packages/react/src/ReactChildren.js
@@ -212,7 +212,7 @@ type MapFunc = (child: ?React$Node) => ?ReactNodeList;
  *
  * See https://reactjs.org/docs/react-api.html#reactchildrenmap
  *
- * The provided mapFunction(child, key, index) will be called for each
+ * The provided mapFunction(child, index) will be called for each
  * leaf child.
  *
  * @param {?*} children Children tree container.

Original file line number	Diff line number	Diff line change
`@@ -212,7 +212,7 @@ type MapFunc = (child: ?React$Node) => ?ReactNodeList;`
`212`	`212`	`*`
`213`	`213`	`* See https://reactjs.org/docs/react-api.html#reactchildrenmap`
`214`	`214`	`*`
`215`		`- * The provided mapFunction(child, key, index) will be called for each`
	`215`	`+ * The provided mapFunction(child, index) will be called for each`
`216`	`216`	`* leaf child.`
`217`	`217`	`*`
`218`	`218`	`* @param {?*} children Children tree container.`