docs: tweaks

Author: ulivz

Diff for: packages/docs/docs/plugin/README.md

@@ -181,7 +181,7 @@ module.exports = {
 - Type: `array`
 - Default: `undefined`
 
-A plug-in can contain multiple plug-ins like a preset.
+A plug-in can contain multiple plugins like a preset.
 
 
 ```js

Diff for: packages/docs/docs/theme/README.md

@@ -58,7 +58,7 @@ Considering backward compatibility, Vue components located at theme root directo
 
 ### Layout Component
 
-Suppose your topic Layouts folder is as follows:
+Suppose your theme layouts folder is as follows:
 
 ::: vue
 theme

Diff for: packages/docs/docs/zh/theme/README.md

@@ -60,7 +60,7 @@ Considering backward compatibility, Vue components located at theme root directo
 
 ### Layout Component
 
-Suppose your topic Layouts folder is as follows:
+Suppose your theme layouts folder is as follows:
 
 ::: vue
 theme