Adds p_They (and friends) for capitalized pronoun helpers (#76910)

## About The Pull Request

![image](https://github.com/tgstation/tgstation/assets/66640614/f8afe149-85cf-40d2-a5c1-4c96a3ccdfe4)

Basically replaces p_they(TRUE) with p_They

## Why It's Good For The Game
Fewer ambiguous parameters (what does TRUE mean when passed to p_they?)
More comprehensive helper functions.

## Changelog
🆑 Tattle
spellcheck: Fixed the grammar on a few revenant messages
/🆑

---------

Co-authored-by: tattle <article.disaster@gmail.com>

code/modules/wiremod/shell/brain_computer_interface.dm

@@ -223,7 +223,7 @@
 	SIGNAL_HANDLER
 
 	if (isobserver(mob))
-		examine_text += span_notice("[source.p_they(capitalized = TRUE)] [source.p_have()] <a href='?src=[REF(src)];open_bci=1'>\a [parent] implanted in [source.p_them()]</a>.")
+		examine_text += span_notice("[source.p_They()] [source.p_have()] <a href='?src=[REF(src)];open_bci=1'>\a [parent] implanted in [source.p_them()]</a>.")
 
 /obj/item/circuit_component/bci_core/Topic(href, list/href_list)
 	..()