Docs: SetCollisionByExclusion() and friends

Fixes phaserjs#5179

Thanks @BoltKey

Author: samme

src/tilemaps/Tilemap.js

@@ -2029,7 +2029,7 @@ var Tilemap = new Class({
     /**
      * Sets collision on all tiles in the given layer, except for tiles that have an index specified in
      * the given array. The `collides` parameter controls if collision will be enabled (true) or
-     * disabled (false).
+     * disabled (false). Tile indexes not currently in the layer are not affected.
      *
      * If no layer specified, the map's current layer is used.
      *

src/tilemaps/components/SetCollisionByExclusion.js

@@ -11,7 +11,7 @@ var SetLayerCollisionIndex = require('./SetLayerCollisionIndex');
 /**
  * Sets collision on all tiles in the given layer, except for tiles that have an index specified in
  * the given array. The `collides` parameter controls if collision will be enabled (true) or
- * disabled (false).
+ * disabled (false). Tile indexes not currently in the layer are not affected.
  *
  * @function Phaser.Tilemaps.Components.SetCollisionByExclusion
  * @private

src/tilemaps/dynamiclayer/DynamicTilemapLayer.js

@@ -1032,7 +1032,7 @@ var DynamicTilemapLayer = new Class({
     /**
      * Sets collision on all tiles in the given layer, except for tiles that have an index specified in
      * the given array. The `collides` parameter controls if collision will be enabled (true) or
-     * disabled (false).
+     * disabled (false). Tile indexes not currently in the layer are not affected.
      *
      * @method Phaser.Tilemaps.DynamicTilemapLayer#setCollisionByExclusion
      * @since 3.0.0

src/tilemaps/staticlayer/StaticTilemapLayer.js

@@ -1229,7 +1229,7 @@ var StaticTilemapLayer = new Class({
     /**
      * Sets collision on all tiles in the given layer, except for tiles that have an index specified in
      * the given array. The `collides` parameter controls if collision will be enabled (true) or
-     * disabled (false).
+     * disabled (false). Tile indexes not currently in the layer are not affected.
      *
      * @method Phaser.Tilemaps.StaticTilemapLayer#setCollisionByExclusion
      * @since 3.0.0