Update README_RGB.md

README_RGB.md

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 This document utilizes phenotypic data derived from raw RGB images captured by the [Ag Alumni Seed Phenotyping Facility (AAPF)](https://ag.purdue.edu/aapf/). The data is available in two formats:
 
 - Masterfile (.xlsx): This file contains a compilation of spreadsheets and a guide document explaining the data contents.
-- Raw Measurement Data: This folder structure houses individual spreadsheets (.csv format) and corresponding images (.png format) for each measured phenotype.
+- Raw Measurement Data: This folder structure houses individual spreadsheets (.csv) and corresponding images (.png) for each measured phenotype.
 
 
 ### File System Structure