Document in the source code that the justified nav is meant for single line list items only. This should help prevent Issues like #15906 in the future.

Fixes #15106.
Closes #15910.

ScrollSpy: Small style consistency adjustments

[Docs—Fixes #15882]Use an ID as the example for Scrollspy

Updated license links

docs>components>labels headings

docs>components>progress bars headings

Add plugin package keyword recommendation

docs>components>(remaining components) headings

docs>components>media object headings

docs>components>thumbnails headings

docs>components>button-dropdowns headings 

docs>components>button-groups headings

docs>components>dropdowns.html headings

Bump markdown-it to ^3.0.7

bump time-grunt to ^1.1.0

Bump markdown it to 3.0.7

3.0.7 / 2015-02-22

Match table columns count by header.
Added basic CLI support.
Added \v \f to valid whitespaces.
Use external package for unicode data (punctuation).

Closes #15904

Redo of #15876

Add unit tests for aria-hidden to modal suite

Add tests for `aria-hidden` of modal

Use strictEqual of 1 here instead of 2 asserts

Modernize QUnit usage by avoiding usage of global functions

Added attributes rel and target.

Fixes #15882 — Use an ID as the example for Scrollspy so that it is more clear that this is for use with a single nav.

Change CC link in footer to HTTPS

Update Creative Commons link to HTTPS.

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upgrade to QUnit v1.17.1

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