fix several typos in code and sentences#525

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youngroklee-ml wants to merge 7 commits intohadley:mainfrom youngroklee-ml:master

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Commits on Nov 7, 2021

correct typo: "timed evaluation" --> "timed invalidation"
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Commits on Mar 13, 2022

fix typo in code; match to input ID
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Commits on Apr 7, 2022

add () to read reactive value
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Commits on Apr 16, 2022

change running() to r$running
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change df() to df because it is created by reactiveValues(), not reactiveVal()
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Commits on Apr 24, 2022

align multiple assignment to a sequence of return values from selectVarServer()
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Commits on May 2, 2022

match function name to code: wizardUi() --> wizardUI()
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