Update Performance.md

Summary:
<!--
Thank you for sending the PR! We appreciate you spending the time to work on these changes.

Help us understand your motivation by explaining why you decided to make this change.

You can learn more about contributing to React Native here: http://facebook.github.io/react-native/docs/contributing.html

Happy contributing!

-->

Removing the `react-addons-perf` reference since now RN relies on React 16, and it's not [supported anymore](https://reactjs.org/docs/perf.html).

Nothing to test.

[DOCS] [BUGFIX] [Performance.md] removing old reference in the doc.
<!--
Help reviewers and the release process by writing your own release notes

**INTERNAL and MINOR tagged notes will not be included in the next version's final release notes.**

  CATEGORY
[----------]        TYPE
[ CLI      ]   [-------------]      LOCATION
[ DOCS     ]   [ BREAKING    ]   [-------------]
[ GENERAL  ]   [ BUGFIX      ]   [-{Component}-]
[ INTERNAL ]   [ ENHANCEMENT ]   [ {File}      ]
[ IOS      ]   [ FEATURE     ]   [ {Directory} ]   |-----------|
[ ANDROID  ]   [ MINOR       ]   [ {Framework} ] - | {Message} |
[----------]   [-------------]   [-------------]   |-----------|

[CATEGORY] [TYPE] [LOCATION] - MESSAGE

 EXAMPLES:

 [IOS] [BREAKING] [FlatList] - Change a thing that breaks other things
 [ANDROID] [BUGFIX] [TextInput] - Did a thing to TextInput
 [CLI] [FEATURE] [local-cli/info/info.js] - CLI easier to do things with
 [DOCS] [BUGFIX] [GettingStarted.md] - Accidentally a thing/word
 [GENERAL] [ENHANCEMENT] [Yoga] - Added new yoga thing/position
 [INTERNAL] [FEATURE] [./scripts] - Added thing to script that nobody will see
-->
Closes #17004

Differential Revision: D6434107

Pulled By: hramos

fbshipit-source-id: 7080c8054072ffb3e2ea58dcb89997585a5d5833

docs/Performance.md

@@ -172,8 +172,6 @@ Access it by selecting Perf Monitor from the Debug menu.
 
 For iOS, Instruments is an invaluable tool, and on Android you should learn to use [`systrace`](docs/performance.html#profiling-android-ui-performance-with-systrace).
 
-You can also use [`react-addons-perf`](https://facebook.github.io/react/docs/perf.html) to get insights into where React is spending time when rendering your components.
-
 Another way to profile JavaScript is to use the Chrome profiler while debugging.
 This won't give you accurate results as the code is running in Chrome but will give you a general idea of where bottlenecks might be.