Update readme.md

Author: smpetersgithub

Database Tips and Tricks/Subtracting Two Dates/readme.md

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 This directory contains the implementation details for a function that accurately subtracts two dates and parses the output into its various parts (Days, Hours, Minutes, Seconds, NanoSeconds).
 
-For documentation please read **Database Tips and Tricks.pdf** in the parent directory. 
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-#### In this directory you will find the following:
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-#### FnDateDiffPartsChar.sql
-Script to create the FnDateDiffPartsChar function.  This is a scalar valued function that returns a varchar.
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-#### FnDateDiffPartsTable.sql
-Script to create the FnDateDiffPartsTable function. this is a table valued function that returns an integer column for each date part.
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+For documentation please read **Instructions for Subtracting Two Dates.pdf** in the parent directory.