[SPARK-28473][DOC] Stylistic consistency of build command in README#25231

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Commits on Jul 22, 2019

Update README.md
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Commits on Jul 23, 2019

Update docs so that all shell command examples are prepended with ./
Mister-Meeseeks
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Enforce ./-prepended command consistencency in documentation
Mister-Meeseeks
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