PARQUET-272: Updates docs description to match data model
PARQUET-272: Updates docs description to match data model

Author: Ben Pence <bpence@twitter.com>

Closes #190 from benpence/doc_fixes and squashes the following commits:

0d5da56 [Ben Pence] Updates docs description to match data model

cchang738/parquet-mr,nguyenvanthan/parquet-mr,HyukjinKwon/parquet-mr,coughman/incubator-parquet-mr,nguyenvanthan/parquet-mr,cchang738/parquet-mr,piyushnarang/parquet-mr,sworisbreathing/parquet-mr,nguyenvanthan/parquet-mr,piyushnarang/parquet-mr,SaintBacchus/parquet-mr,MickDavies/incubator-parquet-mr,piyushnarang/parquet-mr,rdblue/parquet-mr,cchang738/parquet-mr,DataDog/parquet-mr,nitin2goyal/parquet-mr-1,jaltekruse/parquet-mr-1,DataDog/parquet-mr,nezihyigitbasi-nflx/parquet-mr,HyukjinKwon/parquet-mr-1,MickDavies/incubator-parquet-mr,SinghAsDev/parquet-mr,saucam/incubator-parquet-mr,Zariel/parquet-mr,saucam/incubator-parquet-mr,sworisbreathing/parquet-mr,laurentgo/parquet-mr,sircodesalotOfTheRound/parquet-mr,MickDavies/incubator-parquet-mr,zhenxiao/parquet-mr,apache/parquet-mr,winningsix/incubator-parquet-mr,Zariel/parquet-mr,SinghAsDev/parquet-mr,rdblue/parquet-mr,DataDog/parquet-mr,laurentgo/parquet-mr,winningsix/incubator-parquet-mr,zhenxiao/parquet-mr,nitin2goyal/parquet-mr-1,HyukjinKwon/parquet-mr,jaltekruse/parquet-mr-1,sircodesalotOfTheRound/parquet-mr,HyukjinKwon/parquet-mr-1,apache/parquet-mr,nitin2goyal/parquet-mr-1,HyukjinKwon/parquet-mr,sworisbreathing/parquet-mr,SinghAsDev/parquet-mr,SaintBacchus/parquet-mr,apache/parquet-mr,winningsix/incubator-parquet-mr,Zariel/parquet-mr,spena/parquet-mr,laurentgo/parquet-mr,zhenxiao/parquet-mr,rdblue/parquet-mr,spena/parquet-mr,nezihyigitbasi-nflx/parquet-mr,saucam/incubator-parquet-mr,nezihyigitbasi-nflx/parquet-mr,HyukjinKwon/parquet-mr-1,coughman/incubator-parquet-mr,SaintBacchus/parquet-mr,coughman/incubator-parquet-mr,sircodesalotOfTheRound/parquet-mr,jaltekruse/parquet-mr-1,spena/parquet-mr