Update "Try Serverless" language in Quickstart guide

[neverett]

What changes were proposed in this pull request?

Updates language in the "Try Flyte in your browser" section of the Quickstart guide.

Check all the applicable boxes

• [ ] All new and existing tests passed.
• [x] All commits are signed-off.

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 36.18%. Comparing base (7136919) to head (b34d9a4). Report is 164 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5698   +/-   ##
=======================================
  Coverage   36.18%   36.18%           
=======================================
  Files        1302     1302           
  Lines      109614   109614           
=======================================
  Hits        39660    39660           
  Misses      65809    65809           
  Partials     4145     4145           

Flag	Coverage Δ
unittests-datacatalog	51.37% <ø> (ø)
unittests-flyteadmin	55.33% <ø> (ø)
unittests-flytecopilot	12.17% <ø> (ø)
unittests-flytectl	62.18% <ø> (ø)
unittests-flyteidl	7.12% <ø> (ø)
unittests-flyteplugins	53.34% <ø> (ø)
unittests-flytepropeller	41.71% <ø> (ø)
unittests-flytestdlib	55.35% <ø> (ø)

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[neverett]

@EngHabu I accepted your suggestion, can you review again? Thanks!