Fix a typo in swig documentation
Fix a typo in swig documentation

* subversion/bindings/swig/INSTALL:
    I can spell D-L-L.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion