Rename TestRail sample (cloud) CSV to match Doc

[vnaipaul]

More housekeeping: matching the filename of the sample CSV between cloud & server versions.

Before

bash-3.2$ pwd
/git/xray/xray-code-snippets/use_cases/import_from_testrail
bash-3.2$ grep comicE README.md 
python3 testrail2Xray.py -i comic_estore.xml -o comicEstore.csv
python3 testrail2Xray.py -i comic_estore.xml -o comicEstore.csv
python3 testrail2Xray.py -i comic_estore.xml -o comicEstore.csv -e https://testrail.com/
bash-3.2$ ls -l */comicE*.csv
-rw-r--r--  1 vnaipaul  staff  1738 11 Nov 21:12 cloud/comicEStore.csv
-rw-r--r--  1 vnaipaul  staff  1386 11 Nov 21:09 server/comicEstore.csv

After

bash-3.2$ pwd
/git/xray/xray-code-snippets/use_cases/import_from_testrail
bash-3.2$ grep comicE README.md
python3 testrail2Xray.py -i comic_estore.xml -o comicEstore.csv
python3 testrail2Xray.py -i comic_estore.xml -o comicEstore.csv
python3 testrail2Xray.py -i comic_estore.xml -o comicEstore.csv -e https://testrail.com/
bash-3.2$ ls -l */comicE*.csv  
-rw-r--r--  1 vnaipaul  staff  1738 11 Nov 21:14 cloud/comicEstore.csv
-rw-r--r--  1 vnaipaul  staff  1386 11 Nov 21:09 server/comicEstore.csv