docs: add supported version for import & module-import externals (#7369)

Author: snitin315

src/content/configuration/externals.mdx

@@ -479,6 +479,8 @@ Note that there will be an `import` statement in the output bundle.
 
 ### externalsType.import
 
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 Specify the default type of externals as `'import'`. Webpack will generate code like `import('...')` for externals used in a module.
 
 #### Example
@@ -524,6 +526,8 @@ Note that the output bundle will have an `import()` statement.
 
 ### externalsType.module-import
 
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 Specify the default type of externals as `'module-import'`. This combines [`'module'`](#externalstypemodule) and [`'import'`](#externalstypeimport). Webpack will automatically detect the type of import syntax, setting it to `'module'` for static imports and `'import'` for dynamic imports.
 
 Ensure to enable [`experiments.outputModule`](/configuration/experiments/#experimentsoutputmodule) first if static imports exist, otherwise, webpack will throw errors.