Minor fixes

Author: FileEX

functions/Effects/createEffect.yaml

@@ -43,7 +43,7 @@ client:
     oop: true
   returns:
     values:
-    - type: effect
+    - type: effect|false
       name: the effect
     description: Returns the [[effect]] element if creation was successful, **false** otherwise.
   oop:

functions/Effects/getEffectDensity.yaml

@@ -11,7 +11,7 @@ client:
     oop: true
   returns:
     values:
-    - type: float
+    - type: float|false
       name: density
     description: Returns [[float]] as effect density or **false** if invalid effect element passed.
   oop:

functions/Effects/getEffectSpeed.yaml

@@ -15,7 +15,7 @@ client:
     oop: true
   returns:
     values:
-    - type: float
+    - type: float|false
       name: effect speed
     description: Returns [[float]] containing the effect's speed, **false** if invalid arguments
       were specified.