Fix a typo in a test description, in case anyone is grepping for "obstruction".
Fix a typo in a test description, in case anyone is grepping for "obstruction".

* subversion/tests/cmdline/switch_tests.py
  (forced_switch_failures): "types of obstuctions" -> "types of obstruction".


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@871586 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion