Update Performance.md

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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.
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  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
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Closes #17004

Differential Revision: D6434107

Pulled By: hramos

fbshipit-source-id: 7080c8054072ffb3e2ea58dcb89997585a5d5833

Author: kelset

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.