Merge pull request #188 from ktaranov/master

Fix typos in folder name and delete garbarge in README.md

Author: perrysk-msft

samples/features/security/pwermissions-posters/Permissions_Poster_SQL_Server_2008_R2.pdf renamed to samples/features/security/permissions-posters/Permissions_Poster_SQL_Server_2008_R2.pdf

@@ -7,4 +7,3 @@ Useful link: http://social.technet.microsoft.com/wiki/contents/articles/11842.sq
  - [Microsoft SQL Server 2014 Permissions Poster](Permissions_Poster_SQL_Server_2014.pdf)
  - [Microsoft SQL Server 2016 and SQLDB Permissions Poster](Permissions_Poster_SQL_Server_2016_and_SQLDB.pdf)
  - [Microsoft SQL Server VNext and SQLDB Permissions Poster](Permissions_Poster_SQL_Server_vNext_and_SQLDB.pdf)
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