Change second person references to third person references in METcalcpy User's Guide

[lisagoodrich]

Describe the Task

*Run grep for instances of "you" and replace with "the user", for example:
grep you * in METcalcpy/docs/Users_Guide

find . -name ".rst" | xargs egrep -n you
The above command will find all instances of "you" in the current directory and below.
We are using second person (you) references in places, but should be using third person ("the user") instead. METexpress and METviewer documentation was formatted this way..

Time Estimate

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Issues should represent approximately 1 to 3 days of work.

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NONE.

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Define Related Issue(s)

Consider the impact to the other METplus components.

• METplus, MET, METdataio, METviewer, METexpress, METcalcpy, METplotpy

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