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Line 22 of README.txt for version 7.x-2.0 is as follows:
Install as usual, see http://drupal.org/node/70151 for further information.
But this should read:
Install as usual, see http://drupal.org/documentation/install/modules-themes/modules-7 for further information.
If someone can direct me to documentation on how to create a patch with git I'll happily create a patch and post it to this thread - note that I'm working with a standard download of wysiwyg.module rather than a clone of the git repo from drupal.org.