[MIRROR] Adds a notice to PDAs that their batteries can be removed (#27535)

* Adds a notice to PDAs that their batteries can be removed  (#82937)

## About The Pull Request

This adds a span notice on examine to PDAs containing a power cell that
the cell can be removed by right clicking

Discussed this morning in coder general:
* Lots of functions have been moved to PDAs, but their batteries deplete
obnoxiously quickly
* Dedicated PDA chargers are not wanted per Mothblocks, and would be map
clutter
* Existing rechargers cannot be made more available because they
recharge guns, but are the only 'obvious' way to recharge PDAs.
* PDA batteries can actually be removed and externally recharged - but
there is nothing in game telling players this.
* There is also nothing on the wiki telling players this.
* Left click w/ screwdriver = nothing, but right click removes cell is
completely non-intuitive and inconsistent with all other tool use.

## Why It's Good For The Game

Actually telling players about an interaction is good and the
description of this PR is already longer than the code change.

## Changelog
🆑
fix: On examine PDAs will now inform players that the power cell can be
removed for recharging or replacement, and how to do so.
/🆑

* Adds a notice to PDAs that their batteries can be removed

---------

Co-authored-by: Vire <66576896+Maurukas@users.noreply.github.com>

code/modules/modular_computers/computers/item/computer.dm

@@ -397,6 +397,9 @@
 			. += "Its identification card slot is currently occupied."
 		. += span_info("Alt-click [src] to eject the identification card.")
 
+	if(internal_cell)
+		. += span_info("Right-click it with a screwdriver to eject the [internal_cell]")
+
 /obj/item/modular_computer/examine_more(mob/user)
 	. = ..()
 	. += "Storage capacity: [used_capacity]/[max_capacity]GQ"