Docs: Update IIS setup instructions

Reference to the wiki folder was incorrect

editions/tw5.com/tiddlers/saving/Example web.config for IIS.txt

@@ -15,7 +15,7 @@
            stdoutLogFile=".\node.log"
            startupTimeLimit="20"
            processPath="C:\Program Files\nodejs\node.exe"
-           arguments=".\node_modules\tiddlywiki\tiddlywiki.js ./MyStuff --server PORT $:/core/save/all text/plain text/html "" "" 127.0.0.1 /MyApp">
+           arguments=".\node_modules\tiddlywiki\tiddlywiki.js ./wiki --server PORT $:/core/save/all text/plain text/html "" "" 127.0.0.1 /MyApp">
             <environmentVariables>
                 <environmentVariable name="PORT" value="%HTTP_PLATFORM_PORT%" />
                 <environmentVariable name="NODE_ENV" value="Production" />