docs(steps): fix wrong name for timestamp selector

[deepyaman]

Resolves #134

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.94%. Comparing base (80881f8) to head (7d2e32f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #139   +/-   ##
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  Coverage   84.94%   84.94%           
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  Files          26       26           
  Lines        1920     1920           
=======================================
  Hits         1631     1631           
  Misses        289      289           

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[deepyaman]

@jcrist @jitingxu1 Do you have any thoughts about the step being called ExpandDateTime? Ibis seems to use the name Timestamp instead of DateTime, so I'm thinking about renaming it to ExpandTimestamp.

[jitingxu1]

@jcrist @jitingxu1 Do you have any thoughts about the step being called ExpandDateTime? Ibis seems to use the name Timestamp instead of DateTime, so I'm thinking about renaming it to ExpandTimestamp.

it works for me.

[jitingxu1]

LGTM