simpleperf: refactor executable commands reference.
1. Use limit of 100 columns per line.
2. Improve sentences.
3. In commands section, add a brief description for each cmd.
4. In the list cmd, add description for raw events.
5. In the record cmd:
5.1 Add example of using -a and --app option.
5.2 Add section of recording call graph.
5.3 Add section of recording off CPU time.
6. In the report cmd, add section of reporting call graph.
7. In the common issues, add suggestion to improve
call graph results.
Bug: http://b/69128787
Test: none.
Change-Id: Ie78095c89e885312eef2080634a563a95bb6f574
4 files changed