Suricata

Throughout the docs, there are several cases where the text mentioned "we" when in fact it's referring
to the user. In such cases, "we" should be replaced by "you" - or some other rewording.

One such example from https://docs.suricata.io/en/latest/rules/thresholding.html#type-threshold:
"This signature only generates an alert if we get 10 inbound emails or..."

This we actually means you (you, as in the user).

Cf discussion https://github.com/OISF/suricata/pull/9595#discussion_r1357496315

One way to go by this task is to split work by documentation chapters (depending on how much work there is to be done).
The overall workflow tor this task should look somewhat like:
- submit a batch of changes (say, focusing on a single file);
- get feedback;
- incorporate feedback into a new PR;
- get new patch approved and merged;
- submit another batch of changes;
- iterate and repeat...