[BUGFIX] Fix name and location of demo .htaccess file in install tool

Resolves: #87083
Releases: master
Change-Id: I674fb3a93c0e399124bbee7dfc0280275116bdcc
Reviewed-on: https://review.typo3.org/59035
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Joerg Kummer <typo3@enobe.de>
Reviewed-by: Daniel Goerz <daniel.goerz@posteo.de>
Tested-by: Daniel Goerz <daniel.goerz@posteo.de>
Reviewed-by: Josef Glatz <josef.glatz@typo3.org>
Tested-by: Josef Glatz <josef.glatz@typo3.org>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>

typo3/sysext/core/Configuration/DefaultConfigurationDescription.yaml

@@ -358,7 +358,7 @@ BE:
               <p>
                 If enabled, included CSS and JS files loaded in the TYPO3 Backend will have the timestamp embedded in the filename, ie. <code>filename.1269312081.js</code>.
                 This will make browsers and proxies reload the files if they change (thus avoiding caching issues).
-                <strong>IMPORTANT:</strong> This feature requires extra <code>.htaccess</code> rules to work (please refer to the <code>_.htaccess</code> file shipped with TYPO3).</p>
+                <strong>IMPORTANT:</strong> This feature requires extra <code>.htaccess</code> rules to work (please refer to the <code>typo3/sysext/install/Resources/Private/FolderStructureTemplateFiles/root-htaccess</code> file shipped with TYPO3).</p>
               <p>If disabled the last modification date of the file will be appended as a query-string.</p>
         debug:
             type: bool
@@ -502,7 +502,7 @@ FE:
             description: |
               Allows to automatically include a version number (timestamp of the file) to referred CSS and JS filenames
               on the rendered page. This will make browsers and proxies reload the files if they change (thus avoiding caching issues).
-              <strong>IMPORTANT</strong>: ''embed'' requires extra <code>.htaccess</code> rules to work (please refer to the <code>_.htaccess</code> file shipped with TYPO3)'
+              <strong>IMPORTANT</strong>: ''embed'' requires extra <code>.htaccess</code> rules to work (please refer to the <code>root-htaccess</code> file shipped with TYPO3 in <code>typo3/sysext/install/Resources/Private/FolderStructureTemplateFiles</code>)
         passwordHashing:
             type: container
             items: