A few description grammar fixes (#27134)

* Double spaces

* more space and misspelling

* Fixing punctuations

* Not now

* double dots

* Apply suggestions from code review

Signed-off-by: Henri215 <77684085+Henri215@users.noreply.github.com>

---------

Signed-off-by: Henri215 <77684085+Henri215@users.noreply.github.com>

code/game/objects/items/devices/radio/encryptionkey.dm

@@ -169,6 +169,6 @@
 /// ported from bay, this goes 'inside' the AI.
 /obj/item/encryptionkey/heads/ai_integrated
 	name = "AI Integrated Encryption Key"
-	desc = "Integrated encryption key"
+	desc = "Integrated encryption key."
 	icon_state = "cap_cypherkey"
 	channels = list("Command" = 1, "Security" = 1, "Engineering" = 1, "Science" = 1, "Medical" = 1, "Supply" = 1, "Service" = 1, "AI Private" = 1, "Procedure" = 1)

code/game/objects/items/devices/transfer_valve.dm

@@ -6,7 +6,7 @@
 	name = "tank transfer valve"
 	icon_state = "valve_1"
 	item_state = "ttv"
-	desc = "Regulates the transfer of air between two tanks"
+	desc = "Regulates the transfer of air between two tanks."
 	var/obj/item/tank/tank_one = null
 	var/obj/item/tank/tank_two = null
 	var/obj/item/assembly/attached_device = null