More descriptive types

[mcnuttandrew]

This PR addresses my feature request for more aggressive/descriptive types (#204). I added description blocks to all of the types that are exposed on the main Tooltip component, based on the descriptions in the read me. A follow PR could be made (or done in this one) to make the readme component documentation be generated from these types.

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[codecov]

Codecov Report

Merging #206 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #206   +/-   ##
=====================================
  Coverage      88%    88%           
=====================================
  Files           3      3           
  Lines          25     25           
  Branches       10     10           
=====================================
  Hits           22     22           
  Misses          3      3

Impacted Files	Coverage Δ
src/Tooltip.tsx	83.33% <ø> (ø)	⬆️

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[afc163]

Conflicting