Document new backend search flags

[Toflar]

Those tables are huge, no idea what's up with the whitespace but I guess that depends on the tool used.
Here's the diff: https://github.com/contao/docs/pull/1750/changes?w=1

[fritzmg]

Those tables are huge, no idea what's up with the whitespace but I guess that depends on the tool used.

Changes are easier to see in the diff, if you don't reformat the whitespace.

[fritzmg]

Thank you @Toflar

[Toflar]

Changes are easier to see in the diff, if you don't reformat the whitespace.

I know, which is why I included the proper link in the description. I didn't adjust the whitespace myself, this is some tooling. Whatever.