docs(callbacks): document remaining callbacks

[levithomason]

Fixes #623, finishes the list of callbacks to be documented. See #623 (comment).

• Accordion
• Dropdown
• SearchCategory
• SerachResult
• Search
• Table

[codecov-io]

Codecov Report

Merging #1445 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1445      +/-   ##
==========================================
- Coverage   99.74%   99.74%   -0.01%     
==========================================
  Files         141      141              
  Lines        2365     2364       -1     
==========================================
- Hits         2359     2358       -1     
  Misses          6        6

Impacted Files	Coverage Δ
src/modules/Dropdown/Dropdown.js	100% <ø> (ø)	✅
src/modules/Accordion/Accordion.js	100% <ø> (ø)	✅
src/views/Comment/Comment.js	100% <ø> (ø)	✅
src/modules/Search/SearchResult.js	100% <ø> (ø)	✅
src/collections/Table/Table.js	100% <ø> (ø)	✅
src/modules/Search/SearchCategory.js	100% <100%> (ø)	✅
src/modules/Search/Search.js	100% <100%> (ø)	✅

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