Update UserGuide.md

[zhxchd]

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[codecov-io]

Codecov Report

Merging #94 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #94   +/-   ##
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  Coverage     65.10%   65.10%           
  Complexity      492      492           
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  Files            94       94           
  Lines          1751     1751           
  Branches        171      171           
=========================================
  Hits           1140     1140           
  Misses          573      573           
  Partials         38       38           

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[jazerler]

Might be a bit unnecessary to talk about switching tabs in help since it doesn't do it. It makes sense to talk about switching in the commands that actually do it, but I'm not sure if you really need to talk about it if it's not going to be done.