Add two examples for custom instances of gelbooru

[Hrxn]

• First example uses some custom options at the "gelbooru_v01" basecategory
  These apply to all instances used herein
• Second example adds all options to the specific "gelbooru_v02" basecategory of TBIB
  These settings are only used by TBIB

If I'm reading that correctly, that is 🤣

Tested this locally with my own config, seems to work though.

[Hrxn]

Well.. I should've double checked against my config file actually in use by the program.

Because it is not entirely correct and not working as described here in this PR.

I was reading this from the example config file, which led me to make an assumption that is apparently not correct.

gallery-dl/docs/gallery-dl-example.conf

Lines 190 to 203 in 492436f

	"mastodon":
	{
	"#": "add 'tabletop.social' as recognized mastodon instance",
	"#": "(run 'gallery-dl oauth:mastodon:tabletop.social to get an access token')",
	"tabletop.social":
	{
	"root": "https://tabletop.social",
	"access-token": "513a36c6..."
	},
	"#": "set filename format strings for all 'mastodon' instances",
	"directory": ["mastodon", "{instance}", "{account[username]!l}"],
	"filename" : "{id}_{media[id]}.{extension}"
	},

Here "access-token" is set at the same level as "root", i.e. as part of/inside of "tabletop.social"

My assumption was that this would also be true for other options in general, like changing the "directory" options etc. as in the PR.

But this is false, so the second example ("gelbooru_v02") is wrong, because the options are set inside "tbib" are not actually used, at least not in my test.

(The example "gelbooru_v01" is still correct (according to my local tests, at least), and working as it is described)

But there is a quick and easy fix:
The closing curly-brace from line 288 can simply be moved in front of the comma in line 252.
Then the syntax should be correct again, and just the whitespace/indentation is a bit off 😄

[mikf]

Right, to define any regular options for a specific site/category from a basecategory, it has to go into its own category block. For example

    "gelbooru_v02":
    {
        "tbib": { "root": "https://tbib.org" }
    },

    "tbib":
    {
        "tag":
        {
            "#": "",
        },
        "filename": "{id}_{md5}.{extension}"
    },

The access-token values for Mastodon are just a special case, like api-root for Gelbooru v0.2.

[mikf]

Also, thank you for this hopefully useful addition and for starting with Wiki entries.