Fixed typo in help

Note: $PSBoundParameters and corresponding variables in the Begin
section are not available if the function arguments were passed via
pipeline. So if one ever happen to implement support for the
ValueFromPipeline attribute, the code that recreates variables from the
bound parameters in examples will need to be moved to the Process block.

New-DynamicParam.ps1

@@ -122,7 +122,7 @@
                 #If no corresponding variable exists, one is created
                     #Get common parameters, pick out bound parameters not in that set
                     Function _temp { [cmdletbinding()] param() }
-                    $BoundLeys = $PSBoundParameters.keys | Where-Object { (get-command _temp | select -ExpandProperty parameters).Keys -notcontains $_}
+                    $BoundKeys = $PSBoundParameters.keys | Where-Object { (get-command _temp | select -ExpandProperty parameters).Keys -notcontains $_}
                     foreach($param in $BoundKeys)
                     {
                         if (-not ( Get-Variable -name $param -scope 0 -ErrorAction SilentlyContinue ) )