Docs - Fix metrics name in user tutorial

[polarG]

Description
In result-summary.md line 73-74, the example of kernel-launch used metrics 'kernel-launch/event_overhead' and 'kernel-launch/wall_overhead'.

But in micro-benchmarks.md line 20-21, the metric names are described as 'kernel-launch/event_time' and ' kernel-launch/wall_time'.

Solution: Use identical metric names described in micro-benchmarks.md.

#649

Major Revision

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Minor Revision

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.80%. Comparing base (e65629a) to head (e400fb7).
Report is 1 commits behind head on release/0.11.

Additional details and impacted files

@@              Coverage Diff              @@
##           release/0.11     #651   +/-   ##
=============================================
  Coverage         85.80%   85.80%           
=============================================
  Files                97       97           
  Lines              6923     6923           
=============================================
  Hits               5940     5940           
  Misses              983      983           

Flag	Coverage Δ
cpu-python3.6-unit-test	71.61% <ø> (ø)
cpu-python3.7-unit-test	71.61% <ø> (ø)
cpu-python3.8-unit-test	71.64% <ø> (ø)
cuda-unit-test	83.88% <ø> (ø)

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[polarG]

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