Clarify documentation about assetsBootstrapLocation customization

[emanruse]

Prerequisites

• I verified that this is not a filter list issue. Report any issues with filter lists or broken website functionality in the uAssets issue tracker.
• This is NOT a YouTube, Facebook or Twitch report. These sites MUST be reported by clicking their respective links.
• This is not a support issue or a question. For support, questions, or help, visit /r/uBlockOrigin.
• I performed a cursory search of the issue tracker to avoid opening a duplicate issue.
• The issue is not present after disabling uBO in the browser.
• I checked the documentation to understand that the issue I am reporting is not normal behavior.

I tried to reproduce the issue when...

• uBO is the only extension.
• uBO uses default lists and settings.
• using a new, unmodified browser profile.

Description

assetsBootstrapLocation allows to replace the stock asset.json with a custom one. This works as expected, however the effects of such customization are not entirely clear. More specifically:

Right now, there are 3 assets with "content": "internal", which also have https:// URLs, implying that these are supposed to be updated online. It is not clear what will happen if those internal assets do not exist in the user-customized assets.json (or if auto updating of assets is disabled) and how that may affect the work of uBO.

A specific URL where the issue occurs.

irrelevant

Steps to Reproduce

1. Read documentation about deploying uBO

Expected behavior

Clear info about what may happen if internal assets are removed and do not exist in a customized assets.json

Actual behavior

No such info.

uBO version

1.55.0

Browser name and version

Firefox 122

Operating System and version

Fedora 38