docs: add `sassOptions` for sass-loader >= 8 (#1593) [ci skip]

* #65 - add sassOptions for docs

fix docs with error: 'options has an unknown property 'indentedSyntax'.'
which new sass-loader are writen in 'sassOptions';
This should also cause quick prototyping's sass setting, after executing '$vue serve'

* #65 - sassOptions fix for sass-loader

* #65 - fix sassOptions - lang:ru

* add comment for sassOptions version

* add comment for sassOptions

* add comment for sassOptions

* Update docs/guide/pre-processors.md
Co-Authored-By: Haoqun Jiang <haoqunjiang@gmail.com>

* Update pre-processors.md

* Update pre-processors.md

docs/guide/pre-processors.md

@@ -63,6 +63,10 @@ Note that `sass-loader` processes the non-indent-based `scss` syntax by default.
       loader: 'sass-loader',
       options: {
         indentedSyntax: true
+        // sass-loader version >= 8
+        sassOptions: {
+          indentedSyntax: true
+        }
       }
     }
   ]

docs/ru/guide/pre-processors.md

@@ -63,6 +63,10 @@ module.exports = {
       loader: 'sass-loader',
       options: {
         indentedSyntax: true
+        // sass-loader >= 8
+        sassOptions: {
+          indentedSyntax: true
+        }
       }
     }
   ]

docs/zh/guide/pre-processors.md

@@ -63,6 +63,10 @@ module.exports = {
       loader: 'sass-loader',
       options: {
         indentedSyntax: true
+        // sass-loader version >= 8
+        sassOptions: {
+          indentedSyntax: true
+        }
       }
     }
   ]