Update docs on LinkTo in addon-links

[simon360]

The existing docs didn't provide correct examples of how to use LinkTo - it should be the default import from @storybook/addon-links/react, but was documented as a named import from @storybook/addon-links.

Issue: N/A

What I did

Updated the example code in adoon-links, because the reference to LinkTo wouldn't work when used.

How to test

Is this testable with jest or storyshots? No

Does this need a new example in the kitchen sink apps? No

Does this need an update to the documentation? It's purely a documentation update

If your answer is yes to any of these, please make sure to include it in your PR.

[codecov]

Codecov Report

Merging #2926 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2926   +/-   ##
=======================================
  Coverage   35.99%   35.99%           
=======================================
  Files         429      429           
  Lines        9503     9503           
  Branches      975      972    -3     
=======================================
  Hits         3421     3421           
- Misses       5428     5441   +13     
+ Partials      654      641   -13

Impacted Files	Coverage Δ
app/react/src/server/config/babel.js	0% <0%> (-100%)	⬇️
app/react/src/server/babel_config.js	0% <0%> (-76.67%)	⬇️
app/vue/src/server/utils.js	0% <0%> (-53.58%)	⬇️
lib/core/src/client/manager/preview.js	0% <0%> (ø)	⬆️
app/react/src/client/preview/element_check.js	67.64% <0%> (ø)	⬆️
addons/knobs/src/components/types/Select.js	24.63% <0%> (ø)	⬆️
...t-native/src/preview/components/StoryView/index.js	0% <0%> (ø)	⬆️
...react-native/src/manager/components/PreviewHelp.js	0% <0%> (ø)	⬆️
addons/jest/src/components/Indicator.js	0% <0%> (ø)	⬆️
...s/actions/src/lib/types/function/createFunction.js	53.33% <0%> (ø)	⬆️
... and 56 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 95c6b09...ac64ce3. Read the comment docs.

[Hypnosphi]

Thanks @simon360, I totally forgot to update the docs