Organise UG

[tayruxin]

• rearrange order
• Notes change to note for single note
• Added FAQ for linux
• Edit the detail of duplicate checks

[codecov[bot]]

Codecov Report

Merging #261 (43166e1) into master (e6758d1) will not change coverage. Report is 13 commits behind head on master. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #261   +/-   ##
=========================================
  Coverage     74.14%   74.14%           
  Complexity      579      579           
=========================================
  Files            88       88           
  Lines          1895     1895           
  Branches        220      220           
=========================================
  Hits           1405     1405           
  Misses          409      409           
  Partials         81       81           

see 2 files with indirect coverage changes