Fix typo

Change-Id: If3f35326cef033593b69f6f1e3496dd5c283b29d
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/108053
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>
Tested-by: Jenkins

wizards/source/sfdocuments/SF_Form.xba

@@ -261,7 +261,7 @@ REM ----------------------------------------------------------------------------
 Public Function CloseFormDocument() As Boolean
 '''	Close the form document containing the actual form instance
 '''	The form instance is disposed
-'''	The method does nothong if the actual form is not located in a Base form document
+'''	The method does nothing if the actual form is not located in a Base form document
 '''	Args:
 '''	Returns:
 '''		True if closure is successful