Fix doc link to testing agent on local cluster

[Sovietaced]

Fix minor doc link issue found here: https://docs.flyte.org/en/latest/flyte_agents/developing_agents.html

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.23%. Comparing base (16d2b14) to head (1b14be4).
Report is 134 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5398      +/-   ##
==========================================
- Coverage   61.07%   60.23%   -0.84%     
==========================================
  Files         793      646     -147     
  Lines       51210    45691    -5519     
==========================================
- Hits        31274    27522    -3752     
+ Misses      17060    15575    -1485     
+ Partials     2876     2594     -282     

Flag	Coverage Δ
unittests-datacatalog	69.31% <ø> (ø)
unittests-flyteadmin	58.90% <ø> (ø)
unittests-flytecopilot	17.79% <ø> (ø)
unittests-flytectl	?
unittests-flyteidl	79.04% <ø> (ø)
unittests-flyteplugins	61.94% <ø> (ø)
unittests-flytepropeller	57.32% <ø> (ø)
unittests-flytestdlib	65.73% <ø> (ø)

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[Sovietaced]

Seems that the build failures should be unrelated to the doc update

[neverett]

@Sovietaced yeah, those failures are unrelated