Minor grammar fixes and clarification to Vue documentation

[bcass]

Issue: The page of documentation needed a little cleanup

What I did

Fixed up the documentation a bit.

How to test

Read over the diff and make sure it scans.

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? N/A

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

[codecov]

Codecov Report

Merging #1756 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1756   +/-   ##
=======================================
  Coverage   21.14%   21.14%           
=======================================
  Files         252      252           
  Lines        5694     5694           
  Branches      683      684    +1     
=======================================
  Hits         1204     1204           
+ Misses       3962     3958    -4     
- Partials      528      532    +4

Impacted Files	Coverage Δ
app/react/src/server/utils.js	0% <0%> (-32.15%)	⬇️
addons/knobs/src/react/WrapStory.js	12% <0%> (ø)	⬆️
lib/ui/src/modules/ui/configs/handle_routing.js	28.04% <0%> (ø)	⬆️
lib/ui/src/modules/ui/libs/filters.js	47.36% <0%> (ø)	⬆️
lib/ui/src/modules/ui/configs/handle_keyevents.js	33.33% <0%> (ø)	⬆️
addons/knobs/src/components/types/Color.js	8% <0%> (ø)	⬆️
...codemod/src/transforms/update-organisation-name.js	40.62% <0%> (ø)	⬆️
lib/ui/src/modules/api/actions/api.js	50.47% <0%> (ø)	⬆️
lib/ui/src/modules/api/configs/init_api.js	40.47% <0%> (ø)	⬆️
addons/storyshots/src/require_context.js	0% <0%> (ø)	⬆️
... and 19 more

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[ndelangen]

Fantastic @bcass !!! Thank you so much for improving Storybook!

I've published these changes to the site!