fix($shared-utils): Add curly quotes to rSpecial

[verythorough]

Summary

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• Code style update
• Refactor
• Docs
• Build-related changes
• Other, please describe:

If changing the UI of default theme, please provide the before/after screenshot:

Does this PR introduce a breaking change? (check one)

• Yes
• No

If yes, please describe the impact and migration path for existing applications:

This adds “ ” ‘ ’ to the list of characters that convert to - in links. If there are any sites with existing headings that contain those characters, their links will change, potentially resulting in broken links. On the other hand, links that include those characters can behave unpredictably, so they wouldn't have been perfectly working links to begin with.

The PR fulfills these requirements:

• When resolving a specific issue, it's referenced in the PR's title (e.g. fix #xxx[,#xxx], where "xxx" is the issue number)

You have tested in the following browsers: (Providing a detailed version will be better.)

[I checked the link id's in the built html source.]

• Chrome
• Firefox
• Safari
• Edge
• IE

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature
• Related documents have been updated
• Related tests have been updated

To avoid wasting your time, it's best to open a feature request issue first and wait for approval before working on it.

Other information:
I noticed that #1619 and #1855 also include changes to this file. Feel free to wrap this into one of those!

[kefranabg]

Thanks @verythorough 💪

[vue-bot]

Hey @verythorough, thank you for your time and effort spent on this PR, contributions like yours help make Vue better for everyone. Cheers! 💚