docs: fix duplicate word typos in documentation

Fixed two instances of duplicate words:
- 'the the'  'the' in module-variables.mdx
- 'a a'  'as a' in module.mdx

These typos affected readability and professionalism of the documentation.

Author: Rupendra0

src/content/api/module-variables.mdx

@@ -219,7 +219,7 @@ import('./module-a').then((moduleA) => {
 
 <Badge text="5.68.0+" />
 
-It provides access to the the current `module`. `module` is not available in strict ESM.
+It provides access to the current `module`. `module` is not available in strict ESM.
 
 ## \_\_webpack_module\_\_.id (webpack-specific)
 

src/content/configuration/module.mdx

@@ -1244,7 +1244,7 @@ module.exports = {
 };
 ```
 
-When used a a function, it executes for every module and must return a data URI string.
+When used as a function, it executes for every module and must return a data URI string.
 
 ```js
 module.exports = {