Adding more details to be clear that you can set asset version globally or locally on an asset
[#3837] Fixes thanks to stof and WouterJ
minor #3837 More asset version details (weaverryan)

This PR was merged into the master branch.

Discussion
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More asset version details

| Q             | A
| ------------- | ---
| Doc fix?      | no
| New docs?     | no, but follows after #3742
| Applies to    | 2.5+

Hi guys!

This adds some further tweaks to the new feature and docs from #3742:

* moved the absolute asset URL generation part below the new asset versioning feature in the `book/templating` page so that we talk about the "global asset versioning" (i.e. the config option in config.yml) and this new feature right next to each other.

* Added some additional details to make it clear that there is a "global" asset version, and then the ability to override on an asset by asset basis.

I think it's all small details, but @romainneutron if you have a quick chance to look this over, that would be awesome too.

Thanks!

Commits
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4eafdbd [#3837] Fixes thanks to stof and WouterJ
560e010 Adding more details to be clear that you can set asset version globally or locally on an asset