James Rodewig 5ae650ecfd
[DOCS] Fix clarity of URL snapshot repo docs (#56920) (#57212)
Makes following changes to better clarify docs for read-only URL
snapshot repositories:

* Adds an example snippet for registering a URL repository
* Rewrites the protocols paragraph
* Adds a note to explicitly point out that only URLs using the `ftp`,
  `http`, `http`, and `jar` protocols do not need the `path.repo`
  setting.

Fixes #16280
2020-05-27 10:48:19 -04:00
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