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post: fix markdown syntax

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@ -11,7 +11,7 @@ I recently made a significant overhaul to the (GitLab, GL) [CI config](https://g
## New host-based blocklist
As a starter, urlhaus-filter is a malware websites blocklist for uBlock Origin (uBO), with dataset sourced from [URLHaus](https://urlhaus.abuse.ch/). I recently [https://gitlab.com/curben/urlhaus-filter#host-based-blocklist](https://gitlab.com/curben/urlhaus-filter/merge_requests/5) a new hosts-only blocklist that is compatible with host-based blocker (like PiHole), after a user [raised](https://gitlab.com/curben/urlhaus-filter/issues/5) the incompatibility issue. I previously made an erroneous listing on [FilterLists](https://filterlists.com/) (where most users discovered this blocklist, I believe), specifically I set the syntax as "[Domains](https://github.com/collinbarrett/FilterLists/blob/6efb427042aad47a17ed06bafd970004dc675551/data/Syntax.json#L8-L9", instead it should be "[URLs](https://github.com/collinbarrett/FilterLists/blob/6efb427042aad47a17ed06bafd970004dc675551/data/Syntax.json#L32-L33)".
As a starter, urlhaus-filter is a malware websites blocklist for uBlock Origin (uBO), with dataset sourced from [URLHaus](https://urlhaus.abuse.ch/). I recently added a new [host-based blocklist](https://gitlab.com/curben/urlhaus-filter#host-based-blocklist) that is compatible with host-based blocker (like PiHole), after a user [raised](https://gitlab.com/curben/urlhaus-filter/issues/5) the incompatibility issue. I previously made an erroneous listing on [FilterLists](https://filterlists.com/) (where most users discovered this blocklist, I believe), specifically I set the syntax as ["Domains"](https://github.com/collinbarrett/FilterLists/blob/6efb427042aad47a17ed06bafd970004dc675551/data/Syntax.json#L8-L9), instead it should be ["URLs"](https://github.com/collinbarrett/FilterLists/blob/6efb427042aad47a17ed06bafd970004dc675551/data/Syntax.json#L32-L33).
Specifying the correct syntax is essential because FilterLists would show a domain-based blocklist being compatible with PiHole (or any other host-based blocker), in addition to uBO (which supports domain and URL). I'm not sure whether PiHole can parse the domain from a URL filter, perhaps it can, but the incompatibility issue actually stemmed from the use of Adblock Plus (ABP) [syntax](https://help.eyeo.com/en/adblockplus/how-to-write-filters#special-comments) in the blocklist—exclamation mark (!) as comment. The [fix](https://gitlab.com/curben/urlhaus-filter/merge_requests/5) is actually trivial; in the final build step of the usual bloclist, malware domains are concatenated with malware URLs (of well-known domains), so I simply don't concatenate the URLs into the host-based blocklist and uses hash sign (#) as comment. The resulting blocklist doesn't have `Expires` directive like in ABP syntax, I don't know if PiHole supports it.