Merge pull request #3051 from josephharkins/josephharkins-patch-2

Spelling error and grammar

Author: iliakan

2-ui/99-ui-misc/02-selection-range/article.md

@@ -217,7 +217,7 @@ The range object that we created in the example above has following properties:
 
 ## Range selection methods
 
-There are many convenience methods to manipulate ranges.
+There are many convenient methods to manipulate ranges.
 
 We've already seen `setStart` and `setEnd`, here are other similar methods.
 
@@ -438,7 +438,7 @@ As text: <span id="astext"></span>
 
 ## Selection methods
 
-We can work with the selection by addding/removing ranges:
+We can work with the selection by adding/removing ranges:
 
 - `getRangeAt(i)` -- get i-th range, starting from `0`. In all browsers except Firefox, only `0` is used.
 - `addRange(range)` -- add `range` to selection. All browsers except Firefox ignore the call, if the selection already has an associated range.