fix typo in extensibility

Author: r3m0t

docs/extensibility/commandplacement-element.md

@@ -23,7 +23,7 @@ The CommandPlacement element enables buttons, groups, and menus to be included i
 ## Syntax  
 
 ```  
-<CommandPlacement guid=guidMyCommandSet" id="MyCommand" priority="0x001" >  
+<CommandPlacement guid="guidMyCommandSet" id="MyCommand" priority="0x001" >  
   <Parent>... </Parent>  
 </CommandPlacement>  
 ```  
@@ -65,4 +65,4 @@ The CommandPlacement element enables buttons, groups, and menus to be included i
 
 ## See Also  
  [CommandPlacements Element](../extensibility/commandplacements-element.md)   
- [Visual Studio Command Table (.Vsct) Files](../extensibility/internals/visual-studio-command-table-dot-vsct-files.md)
+ [Visual Studio Command Table (.Vsct) Files](../extensibility/internals/visual-studio-command-table-dot-vsct-files.md)