Removes broken new-line markers from a few desc.

Resources/Prototypes/Entities/Structures/Doors/Airlocks/external.yml

@@ -2,7 +2,7 @@
   parent: Airlock
   id: AirlockExternal
   suffix: External
-  description: "It opens, it closes, it might crush you, and there might be only space behind it.\nHas to be manually activated."
+  description: It opens, it closes, it might crush you, and there might be only space behind it. Has to be manually activated.
   components:
   - type: Door
     bumpOpen: false

Resources/Prototypes/Entities/Structures/Power/Generation/Singularity/containment.yml

@@ -1,7 +1,7 @@
 - type: entity
   id: ContainmentFieldGenerator
   name: containment field generator
-  description: A machine that generates a containment field when powered by an emitter.\nKeeps the Singularity docile.
+  description: A machine that generates a containment field when powered by an emitter. Keeps the Singularity docile.
   placement:
     mode: SnapgridCenter
   components:

Resources/Prototypes/Entities/Structures/Power/Generation/Singularity/singularity.yml

@@ -1,7 +1,7 @@
 - type: entity
   id: Singularity
   name: gravitational singularity
-  description: A mesmerizing swirl of darkness that sucks in everything.\nIf it's moving towards you, run.
+  description: A mesmerizing swirl of darkness that sucks in everything. If it's moving towards you, run.
   components:
   - type: Clickable
   - type: Physics