Fix a large number of typos (#89254)

Fixes a very large number of typos. A few of these fixes also extend to
variable names, but only the really egregious ones like "concious".

code/datums/diseases/brainrot.dm

@@ -8,7 +8,7 @@
 	agent = "Cryptococcus Cosmosis"
 	viable_mobtypes = list(/mob/living/carbon/human)
 	cure_chance = 7.5 //higher chance to cure, since two reagents are required
-	desc = "This disease destroys the braincells, causing brain fever, brain necrosis and general intoxication."
+	desc = "This disease destroys the brain cells, causing brain fever, brain necrosis and general intoxication."
 	required_organ = ORGAN_SLOT_BRAIN
 	severity = DISEASE_SEVERITY_HARMFUL
 	bypasses_immunity = TRUE

code/datums/diseases/chronic_illness.dm

@@ -12,7 +12,7 @@
 	infectivity = 0
 	agent = "Quantum Entanglement"
 	viable_mobtypes = list(/mob/living/carbon/human)
-	desc = "A disease discovered in an Interdyne laboratory caused by subjection to timesteam correction technology."
+	desc = "A disease discovered in an Interdyne laboratory caused by subjection to timestream correction technology."
 	severity = DISEASE_SEVERITY_UNCURABLE
 	bypasses_immunity = TRUE
 

code/datums/diseases/weightlessness.dm

@@ -10,7 +10,7 @@
 	disease_flags = CAN_CARRY|CAN_RESIST|CURABLE
 	spreading_modifier = 0.5
 	cure_chance = 4
-	desc = "This disease results in a low level rewrite of the patient's bio-electric signature, causing them to reject the phenomena of \"weight\". Injestion of liquid dark matter tends to stabilize the field."
+	desc = "This disease results in a low level rewrite of the patient's bioelectric signature, causing them to reject the phenomena of \"weight\". Ingestion of liquid dark matter tends to stabilize the field."
 	severity = DISEASE_SEVERITY_MEDIUM
 	infectable_biotypes = MOB_ORGANIC