Better comments in `shared/util.js` code

[sagirk]

Version

2.5.17-beta.0

Reproduction link

https://github.com/vuejs/vue/blob/dev/src/shared/util.js

Steps to reproduce

1. Go to https://github.com/vuejs/vue/blob/dev/src/shared/util.js

What is expected?

Comments in the shared/util.js code to have

• Consistent use of periods
• Consistent use of commas
• Consistent capitalization
• Correct use of articles (a, an, the)
• Correct pluralization
• Shorter sentences in polyfillBind description
• Clearer description for genStaticKeys
• Description for looseIndexOf to be present

What is actually happening?

None of the above

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I am working on a PR to improve the above. Interestingly, this will be my first contribution to Vue.js.

EDIT: Raised the PR — #8529