docs(theme): Fix URLs that were changed in PR #1886

[acdvorak]

No description provided.

[codecov-io]

Codecov Report

Merging #1902 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1902   +/-   ##
=======================================
  Coverage   99.43%   99.43%           
=======================================
  Files          84       84           
  Lines        3721     3721           
  Branches      484      484           
=======================================
  Hits         3700     3700           
  Misses         21       21

Impacted Files	Coverage Δ
packages/mdc-textfield/outline/foundation.js	85% <0%> (-2.5%)	⬇️
packages/mdc-textfield/outline/index.js	90.9% <0%> (-2.43%)	⬇️
packages/mdc-textfield/constants.js	100% <0%> (ø)	⬆️
packages/mdc-textfield/foundation.js	98.23% <0%> (+0.04%)	⬆️
packages/mdc-textfield/index.js	96.55% <0%> (+0.12%)	⬆️

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[lynnmercier]

LGTM