typo: Colletion -> Colletion (#2183)

Author: nschonni

xml/System.Collections.Generic/Dictionary`2+KeyCollection.xml

@@ -746,7 +746,7 @@ lock (ic.SyncRoot) {
 ```  
   
 ```vb  
-Dim ic As IColletion = ...  
+Dim ic As ICollection = ...  
 SyncLock ic.SyncRoot  
    ' Access the collection.  
 End SyncLock  

xml/System.Collections.Generic/Dictionary`2+ValueCollection.xml

@@ -751,7 +751,7 @@ lock (ic.SyncRoot) {
 ```  
   
 ```vb  
-Dim ic As IColletion = ...  
+Dim ic As ICollection = ...  
 SyncLock ic.SyncRoot  
    ' Access the collection.  
 End SyncLock  

xml/System.Collections.Generic/Queue`1.xml

@@ -1036,7 +1036,7 @@ lock (ic.SyncRoot) {
 ```  
   
 ```vb  
-Dim ic As IColletion = ...  
+Dim ic As ICollection = ...  
 SyncLock ic.SyncRoot  
    ' Access the collection.  
 End SyncLock