Update project_organization.rst:(importing section)fix typo, improve grammar (#1824)

* Update project_organization.rst

various grammar, spelling corrections

* gitignore->gdignore

getting_started/workflow/project_setup/project_organization.rst

@@ -56,8 +56,8 @@ Godot versions prior to 3.0 did the import process from files outside
 the project. While this can be useful in large projects, it
 resulted in an organization hassle for most developers.
 
-Because of this, assets are now imported from within the project
-folder transparently.
+Because of this, assets are now transparently imported from within the project
+folder.
 
-If a folder shouldn't be imported into Godot an exception can be made with a
+If a folder shouldn't be imported into Godot, an exception can be made with a
 .gdignore file.