[PerformanceCodelab](Step 4 Analyze performance with system tracing) perfetto keyboard keys description problem

[zhyjNaruto]

hi, when I was following the codelab PerformanceCodelab and tried to use perfetto to practise reading the trace file, I found that some of the keyboards keys not worked as mentioned.

1. [wrong] W and A keys for zoom in/out, [right] W and S keys for zoom in/out
   2.[wrong] S and D for going left and right, [right] A and D for going left and right

maybe the perfetto website update the hotkeys ,and hope codelab to be updated