Add displayName to Link + NavLink (#7958) (#7968)

Author: chaance

packages/react-router-dom/index.tsx

@@ -235,6 +235,10 @@ export const Link = React.forwardRef<HTMLAnchorElement, LinkProps>(
   }
 );
 
+if (__DEV__) {
+  Link.displayName = "Link";
+}
+
 export interface NavLinkProps extends LinkProps {
   activeClassName?: string;
   activeStyle?: object;
@@ -293,6 +297,10 @@ export const NavLink = React.forwardRef<HTMLAnchorElement, NavLinkProps>(
   }
 );
 
+if (__DEV__) {
+  NavLink.displayName = "NavLink";
+}
+
 export interface PromptProps {
   message: string;
   when?: boolean;