Add empty line between header and table for Section 4.0 Command Summary

[joey-chance]

Add an empty line between header and table to fix how the table is rendered on GitHub Pages. Refer to: pages-themes/cayman#82

[codecov-commenter]

Codecov Report

Merging #22 (df7a06b) into documentation/user-guide (0ee685b) will not change coverage.
The diff coverage is n/a.

@@                     Coverage Diff                     @@
##             documentation/user-guide      #22   +/-   ##
===========================================================
  Coverage                       72.15%   72.15%           
  Complexity                        399      399           
===========================================================
  Files                              70       70           
  Lines                            1232     1232           
  Branches                          125      125           
===========================================================
  Hits                              889      889           
  Misses                            311      311           
  Partials                           32       32           

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[ghost]

The fix makes sense. Hope it works.