Fix some style nits in PerformanceTests/README.md

third_party/WebKit/PerformanceTests/README.md

 # Blink Performance Tests
 
 [TOC]
 
 ## Overview
 
 Blink perf tests are used for micro benchmarking the surface of Blink that
 is exposed to the Web. They are the counterpart of [LayoutTests/](../../../docs/testing/layout_tests.md)
 but for performance coverage.
 
@@ skipping 132 matching lines @@
 
 Example of tracing asynchronous tests:
 
 [color-changes-measure-frame-time.html](TestData/color-changes-measure-frame-time.html)
 
 [simple-blob-measure-async.html](TestData/simple-blob-measure-async.html)
 
 
 ## Running Tests
 
-** Running tests directly in browser **
+**Running tests directly in browser**
+
 Most of Blink Performance tests should be runnable by just open the test file
 directly in the browser. However, features like tracing metrics & HTML results
 viewer won't be supported.
 
-** Running tests with Telemetry **
-Assuming your current directory is chromium/src/, you can run tests with:
+**Running tests with Telemetry**
+
+Assuming your current directory is `chromium/src/`, you can run tests with:
 
 `./tools/perf/run_benchmark blink_perf [--test-path=<path to your tests>]`
 
 For information about all supported options, run:
 
 `./tools/perf/run_benchmark blink_perf --help`