Fix some typos and incorrect file path (for "TYPO3 Explained / Extension development") (#6077)

* fix typos and improve sentence as tip

For "The concept of TYPO3 extensions" in Index.rst

* fix incorrect file path

For "/Configuration/Extbase/Persistence" Folder in Index.rst

Author: glmvc

Documentation/ExtensionArchitecture/Concepts/Index.rst

@@ -63,8 +63,11 @@ Below are the most important ones and what they provide:
 :composer:`typo3/cms-install`
     Contains the Install Tool, used for system setup, upgrades, and configuration.
 
-You can use the `get.typo3.or Composer helper <https://get.typo3.org/misc/composer/helper>`_
-to compile composer command for minimal, recommended and full TYPO2 installations
+.. tip::
+
+    You can use the `Composer Helper on get.typo3.org <https://get.typo3.org/misc/composer/helper>`_
+    to generate a Composer command, choosing between default, minimal, or full TYPO3 installation presets,
+    and optionally selecting individual packages and specifying the desired TYPO3 version.
 
 .. _extension-scope:
 

Documentation/ExtensionArchitecture/FileStructure/Configuration/Extbase/Persistence/Index.rst

@@ -12,7 +12,7 @@ This folder can contain the following files:
 
 ..  typo3:file:: Classes.php
     :scope: extension
-    :path: /Configuration/Extbase/Persistence/Classes.php
+    :path: /Configuration/Extbase/Persistence/
     :regex: /^.*Configuration\/Extbase\/Persistence\/Classes\.php$/
     :shortDescription: Contains the mapping between a database table and its Extbase model