Update Documentation/Introduction/Index.rst

Co-authored-by: Beatrycze Volk <beatrycze.volk@slub-dresden.de>

Documentation/Introduction/Index.rst

@@ -31,7 +31,7 @@ Kitodo.Presentation provides a comprehensive toolset covering all basic
 requirements for presenting digitized media: books, archivalia, digital
 depositary copies, manuscripts and letters, prints, newspapers and magazines.
 
-Download of current version is `avaiable on GitHub <https://github.com/kitodo/kitodo-presentation>`_.
+Download of current version is `available on GitHub <https://github.com/kitodo/kitodo-presentation>`_.
 
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 Libraries using Kitodo.Presentation