Allow for just one param to be passed in Help and Topics Attributes

[weitzman]

Drush is not using Attributes for synopsis and description parts in Help

Disposition

This pull request:

• [ ] Fixes a bug
• [x] Adds a feature
• [ ] Breaks backwards compatibility
• [ ] Has tests that cover changes

[codecov[bot]]

Codecov Report

Merging #289 (455894b) into 5.x (10984f1) will not change coverage. The diff coverage is n/a.

:exclamation: Current head 455894b differs from pull request most recent head e99678b. Consider uploading reports for the commit e99678b to get more accurate results

@@            Coverage Diff            @@
##                5.x     #289   +/-   ##
=========================================
  Coverage     89.02%   89.02%           
  Complexity      769      769           
=========================================
  Files            46       46           
  Lines          2068     2068           
=========================================
  Hits           1841     1841           
  Misses          227      227           

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