[fix] correct descriptions of data/treecollection methods

Author: mafanya23

docs/data_collection/api/datacollection_foreach_method.md

@@ -12,9 +12,9 @@ description: You can explore the forEach method of DataCollection in the documen
 
 @params:
 - `callback: function` - a function that will iterate over items of a data collection. The function is called with the following parameters:
-    - `item` - (required) the object of an item
-    - `index` - (optional) the index of an item
-    - `array` - (optional) an array with items
+    - `item` - the object of an item
+    - `index` - the index of an item
+    - `array` - an array of items the method was called upon
 
 @example:
 component.data.forEach(function(item, index, array) {

docs/data_collection/api/datacollection_map_method.md

@@ -12,15 +12,15 @@ description: You can explore the map method of DataCollection in the documentati
 
 @params:
 - `callback: function` - a function that will be called for each item of a component. The function is called with the following parameters:
-    - `item` - (required) the object of an item
-    - `index` - (optional) the index of an item
-    - `array` - (optional) an array with items
+    - `item` - the object of an item
+    - `index` - the index of an item
+    - `array` - an array of items the method was called upon
 
 @returns:
 A new array of items where each item is the result of the callback function.
 
 @example:
-//getting ids of all items of the component
+// getting the ids of all items of the component
 component.data.map(function(item, index, array){
     return item.id;
 });

docs/data_collection/api/datacollection_maprange_method.md

@@ -14,9 +14,9 @@ description: You can explore the mapRange method of DataCollection in the docume
 - `from: number` - the initial position of an item in the range
 - `to: number` - the final position of an item in the range
 - `callback: function` - a function that will be called for each item from the specified range. The function is called with the following parameters:
-    - `item` - (required) the object of an item
-    - `index` - (optional) the index of an item
-    - `array` - (optional) an array with items
+    - `item` - the object of an item
+    - `index` - the index of an item
+    - `array` - an array of items the method was called upon
 
 @returns:
 A new array of matching item objects.

docs/tree_collection/api/treecollection_foreach_method.md

@@ -11,10 +11,10 @@ description: You can explore the forEach method of TreeCollection in the documen
 @signature: {'forEach(callback: function, parentID?: string | number, level?: number): void;'}
 
 @params:
-- `callback: function` - a function that will iterate over items of a tree collection. It takes three parameters:
+- `callback: function` - a function that will iterate over items of a tree collection. It is called with the following parameters:
     - `element: object` - the object of an item of a tree collection
     - `index: number` - the index of an item
-    - `array: object[]` - an array with items
+    - `array: object[]` - an array of items the method was called upon
 - `parentID: string | number` - optional, the parent id. If not specified, the function will start iterating over from the root item.
 - `level: number` - optional, the number of levels to be iterated over. If not specified, each nested level will be visited.
 

docs/tree_collection/api/treecollection_map_method.md

@@ -11,10 +11,10 @@ description: You can explore the map method of TreeCollection in the documentati
 @signature: {'map(callback: function, id?: string | number, direct?: boolean): any;'}
 
 @params:
-- `callback: function` - the function that will be applied to every item. The function can take three parameters:
-    - `item: object` - required, the object of an item
-    - `index: number` - optional, the index of an item
-    - `array: object[]` - optional, an array with items  
+- `callback: function` - the function that will be applied to every item. The function is called with the following parameters:
+    - `item: object` - the object of an item
+    - `index: number` - the index of an item
+    - `array: object[]` - an array of items the method was called upon  
 - `id: string | number` - the ID of a control the child items of which will be included
 - `direct: boolean` - defines whether only direct children of the control will be included in the iteration
 
@@ -29,17 +29,17 @@ toolbar.paint();
 
 To work with all children of a particular control, pass one more parameter to **map()** - the ID of the control:
 
-~~~js
+~~~jsx
 toolbar.data.map((item)=>{
     // disable items
     item.disabled = true;
 },"menu_1");
 toolbar.paint();
 ~~~
 
-If you want to iterate only through immediate children, set the third parameter to _false_:
+If you want to iterate only through immediate children, set the third parameter to *false*:
 
-~~~js
+~~~jsx
 toolbar.data.map((item)=>{
     // add a css class to each item
     item.css = "highlight";

docs/tree_collection/api/treecollection_removeall_method.md

@@ -6,15 +6,16 @@ description: You can explore the removeAll method of TreeCollection in the docum
 
 # removeAll()
 
-@short: removes all items in the target branch
+@short: removes all items in the target branch or all items of the component
 
 @signature: {'removeAll(id: string | number): void;'}
 
 @params:
 
-- `id: string | number` - the id of the branch
+- `id: string | number` - (optional) the id of the branch
 
 @example:
 toolbar.data.removeAll(id);
 
 @descr:
+When called without the parameter, the method removes all items of the component.