Fixed welcome instructions

[shilman]

Issue: N/A

What I did

Updated the snapshot from #1358 and tweaked the instructions slightly

How to test

N/A

[tmeasday]

LGTM

[storybookbot]

	Fails
🚫	PR is not labeled with one of: ["cleanup","breaking","feature","bug","documentation","maintenance","greenkeeper","other"]

Generated by 🚫 dangerJS

[codecov]

Codecov Report

Merging #1359 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1359   +/-   ##
=======================================
  Coverage   14.12%   14.12%           
=======================================
  Files         201      201           
  Lines        4609     4609           
  Branches      493      506   +13     
=======================================
  Hits          651      651           
+ Misses       3547     3511   -36     
- Partials      411      447   +36

Impacted Files	Coverage Δ
app/react/src/demo/Welcome.js	0% <ø> (ø)	⬆️
lib/ui/src/modules/ui/libs/filters.js	41.66% <0%> (ø)	⬆️
app/react/src/client/preview/reducer.js	0% <0%> (ø)	⬆️
.../src/manager/containers/CommentsPanel/dataStore.js	34.78% <0%> (ø)	⬆️
app/react-native/src/preview/story_kind.js	0% <0%> (ø)	⬆️
addons/info/src/components/PropTable.js	0% <0%> (ø)	⬆️
.../ui/src/modules/ui/components/layout/dimensions.js	15.62% <0%> (ø)	⬆️
lib/ui/src/libs/key_events.js	23.25% <0%> (ø)	⬆️
lib/ui/src/modules/ui/components/layout/usplit.js	38.7% <0%> (ø)	⬆️
addons/info/src/components/markdown/code.js	0% <0%> (ø)	⬆️
... and 16 more

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