docs(Grid): fix a typo

[dguo]

No description provided.

[codecov-io]

Codecov Report

Merging #1325 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1325   +/-   ##
=======================================
  Coverage   99.75%   99.75%           
=======================================
  Files         140      140           
  Lines        2402     2402           
=======================================
  Hits         2396     2396           
  Misses          6        6

Impacted Files	Coverage Δ
src/collections/Grid/Grid.js	100% <ø> (ø)	✅

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[levithomason]

Thanks!