Fix typo in react profiler blog post

content/blog/2018-09-10-introducing-the-react-profiler.md

@@ -8,7 +8,7 @@ It will be fully compatible with our upcoming [time slicing and suspense](/blog/
 
 This blog post covers the following topics:
 * [Profiling an application](#profiling-an-application)
-* [Reading performace data](#reading-performace-data)
+* [Reading performance data](#reading-performance-data)
   * [Browsing commits](#browsing-commits)
   * [Filtering commits](#filtering-commits)
   * [Flame chart](#flame-chart)
@@ -42,9 +42,9 @@ When you are finished profiling, click the "Stop" button.
 ![Click "stop" when you are finished profiling](../images/blog/introducing-the-react-profiler/stop-profiling.png)
 
 Assuming your application rendered at least once while profiling, DevTools will show several ways to view the performance data.
-We'll [take a look at each of these below](#reading-performace-data).
+We'll [take a look at each of these below](#reading-performance-data).
 
-## Reading performace data
+## Reading performance data
 
 ### Browsing commits
 Conceptually, React does work in two phases:
@@ -185,4 +185,4 @@ In this case, try selecting a different root in that panel to view profiling inf
 Sometimes a commit may be so fast that `performance.now()` doesn't give DevTools any meaningful timing information.
 In this case, the following message will be shown:
 
-![No timing data to display for the selected commit](../images/blog/introducing-the-react-profiler/no-timing-data-for-commit.png)
+![No timing data to display for the selected commit](../images/blog/introducing-the-react-profiler/no-timing-data-for-commit.png)